Tired of paying for a service that never works

For the past 4 months I have been complaining about my 5G wifi. It gets sorted but for the last 4 weeks now I have been having endless problems with the download and upload speed. I have made endless phonecalls minimum 8 phonecalls in the past 4 weeks. I have spent roughly R 300.00 on airtime. With each and every phonecall i get told the same thing. That they will escelate the issue, that I must reset my router that I must switch it off then change direction then switch it on. Then I get told that they will escelate it to their supervisors who can find out what is happening. I get no feedback then i get told technical will call me and nothing. No phonecall no communication no nothing. My installment comes off now on the 25th and again rain will not hesitate to take money even though I cannot use it. I work from home and if my wifi is not working then i can't work and loose money. I cannot continue loosing money due to pathetic wifi that no one seema bothered to sort out. I lost money on airtime and I loose money each and every month because rain keeps deducting my installments but don't seem bothered to fix the issues. No one has gotten back to me to this day and I am hoping they will see just how serious I am about my complaint