Send me my final invoice

After more than 15 years of being a client with MTN I decided to part with them and moved to Cell C.As per the usual struggle with MTN I cannot get an invoice out of them to settle my account.In store they couldnt help me because I already transfered my number to Cell C network.They gave me a number to call *** but as expected no one answered and after 30 minutes of holding the line I decided to end the call.MTN you guys can now call me to send me my final invoice I have stopped your debit order now so phone or dont get paid.I have hadd it with you bunch.Good bye and good riddance