Bad Service !!!

Before end of March 2024 I decided to buy or rent Wifi Extenders from my service provider. I did the request and it arrived within 7 days. From 2nd April 2024 I struggled to set it up. On the 12 April 2024, and after a weeks phoning and sending mails, a man helped me set it up. He also found out that I was paying since 22 February 2024 for a 120mps line, and I got a 60mps line. He said I must let the accounts people know about this. I send a mail on the 12th April 2024, I phoned a lot of times. They just do not answer or just let you hold for hours. I got phone calls back so that they can help with the setup of the extenders. But I was already helped and I said that to them. I said I want help with my account. I got 'tickets' back that they will help. They send a statement with R122.00 credit. I worked it out, they charged me for 47 days with a 120mps line and not a 60mps line. They deducted my account without even helped me with the account been resolved. My credit must be round about R266.22. I am working from home and I need the internet on a 24/7 basis. Why dont they just help me and sending tickets the whole time that they will help, but I do not get help?????