After sales support and line stability dismal at best

Had my line installed last month and the installation and service was fantastic. Thats where it ended. Ever since I had the line installed its been problematic. I have asked multiple times for assistance and little to none has been given. I completed tests on the line and provided them with the needed details to be able to advise. I eventually got my own router and replaced theirs which improved the connection. Now I sit with the internet dropping again and speeds of a 30mb feeling like dial up. Happy to take my money but no interest in trying to help. It seems that the ISPs of today lack knowledge, integrity and any form of wanting to help their clients. As long as you pay you are not a problem.