Incorrect account information and suspending of li

have been having endless problems with MTN and the service received, where my lines are suspended for incorrect billing saying I have overdue amounts owing when the account is up to date. I called the call centre on several occasions where they advised my acc is up to date and opened the lines. Now twice today my lines were suspended and the newest thing i hear from the call centre us that my credit limit has been exceeded and i need to call credit management to have it increased. They give me a number to call which is totally impossible to get through and an incorrect email address. I don't see how i could exceed my credit limit when i am on the my choice top up and i just did an upgrade so why would u do an upgrade for an smt that is over my credit limit without advising me to increase it. Now both my numbers are suspended 2 times in 1 day. My niece needed to make an urgent call and was unable to. The service I receive from MTN since they took over from Nashua is absolutely disgusting. I cancelled my debit order and pay via eft as MTN'S billing was messed up and they were debiting incorrect amounts. Now I have to deal with lines being suse ended at least twice a week.