Looking for Bulk Message Sender sofware for FB, whatsapp, or any other realtime messaging platform

I am looking for any simple & free or very low cost automation for bulk message sending for pretty much any platform such as WhatsApp, SMS, FB messenger, Telegram, etc. (Platforms that have real time messages).

I will hire as many virtual assistants that I can to run this on their Chrome browser, so if I have to pay too much for the software license then it will add up & not be viable business model.

It must be able to:

• Schedule certain times of day to send messages (Don't want to send people Realtime messages at 3am!)
• Set maximum of messages per day (to not get banned & incrementally raise amount of messages per day as account is aged)
• Ideally import contacts in .csv file so same people don't get same messages.

If any has info on a Free or very low cost bulk message sender, then please DM me.

we provide for Telegram