Mrp mobile contract problem

I cant use my contract Mrp. I get only 500mb of data and when i top up the money show on my balance but i cant use my cel. I tried airtime loading and data budle ....cant work. My contract is for R140 a month but they take R550 from my acc while i cant use my cel.....help ....please im fed up with this. Customer care talk to you like you are a ******** or a stupid customer and no help. My prepaid cell nr are ********** 218.