Suspended Service and unable to speak to a human

MTN suspended my service yesterday saying that my debit order (on my credit card) bounced. It is a really arbitrary message that they send out which could be mistaken for a **** message (no reference to the account number or cell phone etc).<br> In any case, I paid the outstanding amount (after hearing the message on 808) and it got reconnected yesterday afternoon. I am however still receiving sms's about being blacklisted etc. and have tried 4 times to get hold of the accounts department to determine what the issue is and check my debit order details BUT everytime I call 808 I get cut off before I get through to a consultant. This is REALLY frustrating - how does MTN expect their customers to come to the party if they don't want to assist? Must I cancel my contract and port my number? I have been with MTN for years and have NEVER defaulted on payment - now they treat me like a ********!