Incorrect billing!! Terrible customer service!

I have now sent multiple requests to have my account corrected. I ordered the RainOne 101 router in December 2023, under the impression that it was an upgrade to my previous router and plan. This was confirmed when I received no sim card with the new router. However, I was still billed for both plans in Dec, Jan and Feb, whilst only having 1 sim card and 2 routers! The old router was then collected in Feb 2024. An agent tried to phone me ONCE only and then I received an email stating that I couldn't be reached. No further attempt to contact me. Please correct this account immediately, or I will be taking to social media to warn other customers or potential customers. I will not be leaving this here, you have charged and collected money from my account for a service I didn't receive!!!! Emailed them for the umpteenth time, and received an email back from Hlengiwe Msomi, simply saying 'Noted.' Customer service is non-existent!!!!!