Home internet issue

Im very disappointed in the service that I received I phone yesterday 23/04/25 to complain again about my internet speed, I have a 50Mbps home internet line I run a speed test but it doesn’t even go up to 20 Mbps doesn’t matter when I test. Its been more than a month already that Im struggling, every time it’s buffering and loading and says no internet, the lady that I spoke to yesterday said she will phone me today 24/04/25 back, Im currently still waiting for a phone call, so now I must phone back to ask what’s going on with my internet when Im a paying customer every month they deduct my money for something I can barely use, No solution was provided up until now about why this keeps on happening and how they are going to fix this problem