Still I wait!!! SOMEONE CALL ME

I have been waiting for a call back from a cancellation agent since the 3rd of April and I am the one that has had to constantly call the provider to check on progress on my query! Firstly I called MTN in the month of March to make them aware that I would not be renewing my contract, I was advised that I should call a day after my contract expired which would be the 3rd of April. When I called they were experiencing system issues and I could not be transferred to the cancellations department, I was given a reference number and told an agent would contact me within 24 hours, I have been waiting since then and when I call to follow up I am given attitude by consultants and they tell me to wait. I went to a MTN store today and they told me they could not help and that I should call 808 which is the number I have been calling. The lady told me I should have given a months notice meaning I should have told the cancellation department in March that I would cancel my contract, why are MTN workers contradicting themselves? Why am I being misled as a consumer, wasn't I told that I should call a day after the contract expires now I am being told I should have given a months notice in March??