Poor customer service for cancellations

Trying to end a contract with MTN is almost like it’s made to be impossible - I’ve called multiple times over the last month to be told I have to call today (30 days before the contract ends), to call today and get told I must rather call again in November (two weeks before the contract ends)…. I can’t keep being told different things and I will not be liable for incorrect advice given! I need to be given the correct information…