Telkom mobile account Not cancelled

I had a LTE contract since 2017, which finished in Oct 2019. It was then month to month & I completed a closure form to end the contract which I submitted on 1 Jan 2020. The account was still not closed and I was still billed thereafter. I call Telkom mobile numerous times to close the contract, but I'm still being charged for a multi sim every month up until today. Why am I being charged for a multi sim if the contract is closed?? Telkom mobile is really inefficient. My last call to them they stated they would cancel the multi sim & reimburse the credit in the account. The multi sim is not even active! This is so ridiculous!

I need Telkom to re-imburse my money from 1 Jan 2020. Account nr ***