Terrible service and speed issues.

I have asked to be upgraded from my 50mbps line to 100mbps on the 1st of Jan, and I have already received my bill for a 100mbps line but I haven't once gotten 100mbps speed on my speed tests I have done and I am still struggling just to do the basics on the line. I don't even get 50mbps and I have used 3 different speedtests I have also send multiple emails and keep getting email back to say ticket has been logged but when I want to view ticket it has not been found. I have kept the screenshots of the speedtests that I have done. But come the 15th they want their money but yet I haven't received what I have paid for poor service. I will not pay for a 100mbps line I refuse.