Netstar debiting account ********ly

On the 1st of Dec 2022 i cancelled Netstar, and got a confirmation letter for the cancellation. On Dec my account was debited, and then again in January 2023. The Jan debit order i returned, because my notice month was till end Dec. 3 days later, Netstar debited me with double the amount. R807. I called, and they advisef that they slipped up and never cancelled. I told them that it was not my problem, they need to return my R807. They agreed that the issue is on their side, and i got a reference nr for the credit of this amiunt. It is close to a week, and no sign off the credit. I phoned and being send from pillar to post. And nobody calls back, even with promises that they will. Not acceptable.Netstar, this is ***** you need to credit my account.