CHARGING MORE ON MY ACCOUNT MONTHLY AND SUSPENDING

My contract have been suspended for 3 days now - I am on a Top- Up contract and now MTN is saying that my credit limit has been reached? After waiting for 35 minutes to get through to MTN - I was told that my Credit limit has been reached and I have to phone the credit management department. I never received the number and then when I Google'd it I could not get through to them - my account is still suspended even though I don't get why it is because I am on a TOP UP ACCOUNT? <br> The other thing is - I signed a contract of R 430.00 that will be deducted from my account monthly and now the have deducted over R 600 and then R 530 - MTN confirmed that the amounts deducted is not right but \will see what they can do?"I signed for R 430 and I expect to only pay that monthly?<br> I have 2 accounts"