T-Mobile service has gotten progressively worse

I've had T-Mobile service for the last 8 months. For the first 6 months it was fantastic. I was getting 800+ download speeds and almost 100 upload speed. Over the course of the last 2 months I have been switched to their 4G service in which I'm only getting an average of about 120 download and about 5 upload. I've called multiple times and I get the same excuse every time which is they are upgrading their towers. I am positioned almost in the center between three towers and one of them. I'm about a quarter of a mile away from. I can see it from my house. I'm fed up with this low bar of service. As I'm typing this out I have another ISP installing fiber. As soon as he is done, I am calling T-Mobile to cancel my service. I wish you all the best of luck with T-Mobile and I hope that their service gets better for the rest of you who are having issues. As for me, my wife and I both work from home and we can't work with this slow service.