Account in arrears error

My bank account was debited in June 2021 with only R70.00 by Cell C. I was then contacted and advised of the error and told that this would be rectified with the July 2021 debit order. Please see below transactions taken from my bank statement. R996.81 was deducted from my bank account on 15 Jul 2021

I have been told by Cell C that my account remains in arrears as the payment has not been allocated. Yesterday, my voice contract was blocked as a result and I went to the Cell C branch in East Rand Mall to try to resolve the issue. The gentleman assisted me and confirmed that the allocation of payment had not been made and unblocked my contract. The reference number he provided me was ***

The outstanding balance on my Cell C app still reflects R996.81 and when querying again with Nelly Thobejane via Instagram she confirms the payment is still outstanding. This is clearly an internal administration error which requires rectifying and immediate resolution. Please assist