I get around 50k users daily to my website (worldwide), is those 5k conversions all fraudulent?!!
Not necessarily. The suspension can mean that you didn't follow their TOS generally or regarding the offer(s) you promoted. There are forbidden methods/traffic sources you can't use network-wide, on top of that there are forbidden methods/traffic sources you can't use for specific offers. Organic traffic should be ok, but social media traffic is often not allowed or only certain social media sites are not allowed. Maybe you used incentives for non-incentive offers?
Why did they suspend you after a month right before payday? Because that's when they check your performance, at the end of the pay period. One can easily think, something shady is going on, when in fact, it's general procedure. It sucks, but that's how it works.
Whenever a network suspends someone, believe it or not, they lose money too, because they don't get their commission from the advertiser, which can be as much as the publisher earns. If you earned $1.2k and you were suspended, that's around the amount the network lost too. That's $2.4k the advertiser won't pay, which is a loss of $1.2k to you and to the network each.
Networks are responsible for their publishers, because they vetted them (supposedly). Whenever an advertiser is not pleased with a pub, it's a smaller or bigger strike in the relation between the network and the advertiser, in extreme cases advertisers can pull all of their offers from a network. If you aren't that important, networks don't fight for you, they simply go with the decision of the advertiser, because an advertiser is a lot more important than a random publisher, who do earn some money, but nothing really substantial for them.
Very few networks communicate every suspension, usually they don't tell you the exact reason, you only get a canned reply (if any), which makes you wonder and can lead to threads like this.
The amount you don't get now can be substantial for you, but it's nothing for them. You can be sure, that a network this big won't scam you for this amount. Unless you're a super affiliate, you can't expect special treatment. It's simply money they won't get, so you won't get it either. And because you are not super important for them, you are not entitled to a detailed explanation, according ot them. It's a business transaction, it's your responsibility to know and play by the rules, if you don't (even unknowingly), they cut ties and off you go, you don't worth any more of their time. This is the harsh truth.
When you're new to a network, it's recommended to ask your AM whether you can use this or that type of traffic for this or that offer. Being in a good relationship with your AM is always a good idea, because they can often tell you, which offer converts the best for your traffic, so you can skip the (sometimes expensive) initial split testing period.
Whats happening will all the data/money you generated for them?
You never know for sure, but when someone is suspended, it's the advertiser's request most of the time, meaning those earnings are not paid by the advertiser to the network. It's not logical to cut off someone, who brings quality traffic to them, to the contrary, in that case they often tell your AM to rely a message to you to push harder, if possible. When they cut off someone, it's for a reason. It usually happens, when the leads don't convert (=no money generated), so the data is worthless for them.