Advertised and actual benefits not the same - seemingly impossible to fix!

I took a fibre deal 2 months ago that included a free range extender. All was fine with installation, that was great. However the free range extender wasn't included. The installer said I can go to my nearest Telkom store which I did. They had to order it and I finally got it. Great. Except they billed me for this free range extended. Been back twice to the Centurion Telkom Store - they log a call on an app for billing to call me - done 3x and I am still waiting for the call. Tried the online chat 3x and doesn't connect after 15 minutes or gets cut off. Seemingly impossible to get this sorted.