Double payment

I canceled my contract with Telkom on 7 May in store at Telkom Cresta, the lady who assisted me assured me my contract is canceled successfully with immediate effect and final payment will debit on my debit date. No payment was debited and the funds were in my account. On 29.06.2023 at 10.58 am I spoke to Nomazangwa to cancel my account for the second time, reference no: ***2. She assured me on 30.06.2023 the final amount of R313.30 will be debited. Nothing happened, I went back to Telkom in Clearwater on 22.07.2023 to enquire why payment isn't being deducted from my account. I went to Woolworths to pay R313.03 cash and today an amount of R313.03 was debited from my account. I'm very unhappy with the service received, first I struggled to cancel the contract now Telkom received payment twice. I want my money reversed asap