Worst wifi provider

Everything looked good on their website. When a consultant called me I was told I can get the option where they switch over from my old wifi provider to them. All I had to do was pay for my router and wait for my old internet provider to release my line. No installation for fiber was required with this options since I already had one. I specified that it is a free standing property but I am in a flatlet and others have connections on the same property. Once my line was released I waited and never got connected. I kept contacting them until I was told my order was canelled due to them picking up active lines on the property (which I mentioned to the consultant when signing up) they then send someone out to do a new fiber installation which I was not informed of. After installation I was online in about 3 days. The connection is absolutely terrible to this day. I get connected to the other homes wifi when it is far away instead of my own wifi. I try to connect it says "connecting" but does not I have to try multiple times before it finally connects and then cuts whenever it wants. I tried to cancel only to be informed I have to pay installation feel of 2500 because it is less than a year. I finally got to speak to a decent assistant who promised a technician would call but didn't. I emailed her and she said she escalated the matter but I still didn't receive a call back. She is now ignoring my emails. I really need help with canelling this terrible service