Internet speeds throttled without my consent

I have been using Vodacom Home Internet for going on 5 Years, I was living in Midrand opposite Vodaworld where the main base station sits, I was able to reach 20 to 40Mbps down and 15 to 30Mbps up, when i moved to Pretoria East, I was getting speeds 60 and above down and 40 up, 2022 I started noticing my speeds drooping to 15 down and not even 5 up, I called Vodacom to complain because the contract i signed was an open line which means my speeds should not be throttled. The technical department did something and my speeds was restored to 60 and above down and 40 and above up. After sometime i experienced the speeds to drop again and for almost a year of fighting with many agents and technical staff members, my problem is still not resolved. I've recently been migrated to the 100Mbps line which doesn't even come close to 100 most of the time, While i was on a call with an agent tonight i explained to them that i should receive at least close to 100Mbps down and 40 up or vice versa...Asked what my sim profile is been set to and she could not tell me, but she and the rest of the call center agents are more than happy to fight with you and tell you to reset your router or put it on 4G only which I have done and had on for over a year, I get told to uncheck 4G and recheck and see if it works, that to me is a whole load a bull especially when a router is turned off every once in a while, what difference will it make ? I need clarity as to what is the down speed and up speed on the 100Mbps line is meant to be but no one wants to actually come clean, instead i get told Vodacom is going to commission a new tower where i live but that still does not answer my question because i can be throttled at a specific speed on my sim profile that i don't know, also what guarantee will a new tower make? yet we have to keep paying for a service that you not fully getting.