Terrible quality of internet with the vodacom home internet package

Ever since I got a new line last year December for home internet I've been having endless struggles with a terrible poor quality of internet.

I logged the complaint and they tried troubleshooting the lady did tell me that this particular package has an issue however I'm still struggling with the internet and this is a complete utter hinderance to my life as I am going to be in a completely remote role where I actually need a stable internet connection

The Wi-Fi router even packed up already and I had to take it back to the vodacom store and they replaced the router with the same model however the internet decides to come and go as it pleases

Can you guys please help me with this package and do something about it