Invalid Traffic debit

Hi, For the last two months adsense is taking all my earnings as invalid traffic but i havent did anything new. All my traffic comes from Pinterest and i havent used any bots or anything. Last month they took 99% of my earning and left 1% as my balance. This month they did the same thing, i have contacted them and still waiting for a response. Does anyone know why it happens? I got my adsense 2 months ago and my friends have older accounts, they are also getting all the traffic from the source where i am getting and they dont have any problem. Can it be related to my account as i was banned from adsense 2 times. The first time it got blocked i changed my country address and now i have changed my city address. So can they still know its the same person and marked my account spam?