Showmax billed twice for service!!!

I was billed twice for the same service after mid month upgrading to a R99 I'm now billed the R50 and R99 for the same service yet this was only activated on the 29th of July 2020. I have sent through an email 5 days ago with no response. When contacting multi choice I am told they cannot assist and that Showmax doesnt have a call Centre number. They only contactable via email the same email they don't respond too!! That's rather strange.