I got contract from hotel in canada ,and this contract contains company called (global travel agency) in UK,this company will fulfillment all papers required for visa after I sent two payments to them and they told me no more payment required ,and last mail I found them say to me the hotel make account bank for you and the hotel pay 1 month salary in advance and now they ask me to pay us$2.000 to upload my ATM credit card and say to me this is BTA requied .
I don't know what I can do?

You are being SCAMMED. I'm so sorry you sent any money so far.

I am sorry, someone has stolen all the money you sent, This is a scam, there is no job, and you were never required to send money for it. There is no BTA for Canada and it is all a lie.
They will keep coming up with ways to get your money.