Bad service

Called MTN on the 28/2/2022 to cancel my contract, spoke with an agent named Thandi Sefolo and and she advised that it would he cancelled as it had been due for cancellation on the 11/4/2022, I confirmed on the line that there would be no debit at the end of April/ beginning of May, only to find out that I have been debited on the 3/5

I am now sent pillar to post with no assistance on my refund.

My account has been paid diligently every month, I request the same when roles are reversed