Poor service form Telkom Support (accounts)

We upgraded our internet package from a 20Gig softcap to an unlimited bundle in July 2020. The invoice for the next 3 month was as per the new bundle and during November I received an invoice for 2 internet packages. I called Telkom on 23 December 20 to have the 1 package removed from the invoice. After many calls and emails to the 10210 support number I have had no correspondence and I still get invoiced for the 2 internet bundles. Telkom now sends SMS wanting to suspend my account.