MWEB not supplying the Service I am paying for

I want to cancel with Mweb but they are insisting on a date of 1st of November, I refuse to continue for 2 months battling like I have been from the start, I have a 50MB line during the day and have nearly no internet after 5pm, I am paying for a service I am not receiving. Everytime I phone I can either not be assisted and need to try later (via a machine) or they keep sending me on a testing journey that has not helped at all, I have checked the Fibre line and that is fine MWEB is throttling me or something is seriously wrong but no one can assist me its been more than a month now, I am done, MWEB needs to release me from the contract so that I can actually get a service I am paying for.