how to get new exterior cable run?

how do you get a new exterior cable?

the line that runs to my townhouse was put in in 1985. This line has had numerous splices repaired over the years. In 2018 I contacted xfinity about replacing my decades old fios account. while looking at plans through the net I was also on your chat. The chat person promised me everything under the sun including a new exterior line.  I order for a self install. once receiving my equipment I placed it only to find out that I had no service on the outside of the house. six weeks later someone came and SPLICED the wire in two places. I hooked in and cancelled FIOS even though I was not provided what I was promised. The first time it rained my cable was on the fritz. Cable tv would go in and out and the internet would not allow streaming. this went on for months  every time it rained for more than an hour the cable would act up and every time I called about it I was told they were getting good signal there and that "I" would have to call to set up a service appointment. I did this a couple of times. Each tech would tell me the cable has signal. NO ONE would come out when it was raining.

I finally gave up and returned to FIOS. Unfortunately while I had xfinity I grew to like it one sunny days.

so my real question is who do I turn to to get a straight answer on weather or not xfinity will replace a 37 year old faulty wire.