Unnecessary Cable Replacement

I just moved into a new place. I brought my old equipment which was working fine at the old place. Then I had multiple long calls with Xfinity customer service trying to figure out why my internet would intermittently drop connection, causing my modem and router to restart. Eventually, after almost two weeks of this, we had the cable in the house replaced, the one from the box on the exterior of the house to the wall outlet. A guy from HelloTech came and crawled around under the house and did the replacement. He did his job fine. But the problem was not resolved with the new cable. Also, when the internet was connected with the old cable, it was fast, like it was at or near the speed I pay for, so I don't know why they thought it was the cable. And I bought brand new equipment and that didn't solve the issue, also factory resets, power outlet changes, etc. Anyway, after replacing the cable I called back up and told them that didn't work and they had another technician come out and he changed the connection at the street, where there's a tap under a rectangular concrete cover in the sidewalk, and he said the old cable was fine. He said the tap was for me and my neighbor and that the neighbor's connection was corroded and that it could be the issue so he changed them both. Problem solved. But before the problem was solved I had to pay HelloTech 225 bucks for replacing a cable that didn't really need replacing. When I called before the replacement to ask what happens in this scenario I was told Xfinity can't reimburse me for work done by someone else. And HelloTech said they only guarantee the cable they replace is working fine. But I feel a bit bamboozled here. Xfinity was the reason I got the cable replaced and they should have checked that tap connection at the street prior to recommending a cable replacement. Who can I talk to about getting some sort of remuneration for the wasted 225 bucks because of Xfinity's ineptitude?