Is there less than one star ???

I have been trying to resolve this unsuccessfully with MTN for almost three months – • I cancelled the contract in writing – MTN sent it to Retentions for cancellation • I followed up with Retentions • The debit order came off • I returned the debit order • MTN sent me an email informing me my account was in arrears • I called retentions • They cancelled the contract telephonically and told me to email complaints • They lodge a reference • They cant cancel the contract because it is in arrears • The debit order came off • I returned the debit order • MTN sent me an email informing me my account was in arrears • I called retentions • They cancelled the contract telephonically and told me to email complaints • They lodge a reference • They can’’t cancel the contract because it is in arrears …….. etc etc etc until the end of time ?

And it is MY responsibility to prove to them that MTN cancelled the contract ?