Contract expired,but still debited.

I have given Mtn a month notice,on the 28th of April 2022 and the contract was expiring and consultant told me the wifi would stop working on the 22nd of May and last deduction would be then.They will load data on the 12th of May till 22nd and 8 will pay pro-rata. Which they deducted R999 in May and my contract was R399. They have be debiting my account June,July and August,I reversed June and Just,but the cameback into my account in August for R1022. My past experience with Mtn was bad,***** was done in my account early 2000 were their consultants were using my number to make calls,but I gave them a chance again 2020 and I would never again. Reference for call on the 28th of April is Ref nr *** Mashuna and follow up ref nr ***. I want my money back. R1022,R999 was the last money you were suppose to debit.