Mtn *****ulent fees goes up *******ly and disconnected

I have the worst experience with both Mtn branch in Pmb I on the 8th March I took out Home internet month to month and was told to pay R508 it 2 months advance on 4 April I phoned Mtn call centre and was told I must pay R209 I left that amount in my account Mtn tried to take more than the amount than bank charges took all bank fees which R40. I spoke to agent on messenger that that I owe R0 till 6th May. I get account of R749. I went to store this morning and was told to pay R281 and will only get reconnection in 30 days I left the store as with Rain I pay outstanding amount and get connected immediately. Why does the R229 goes up after I sign the papers for R229 it daylight *******. I thought going to Mtn I get better service but I get different amounts. If it does not get sorted out now and get reconnected I want a immediate cancellation.