Me phone service is suspended but installment paid

I put a block on my phone with MTN for when I reach a certain limit to stop the account. My phone has been suspended since last week. My debit order went off already on the 3rd of May. Yet my account is still suspended. You hold on forever on the call centre more the 15 to 20 minutes and when it rings once you are thrown back in the hunt line. When I sent an e-mail now I have to send proof of payment to get my account blocked - what service is this suppose to be. My debit order went through surely they can pick this up on their side and ensure that my phone is unblocked.