Bad support and false advertising

I dont know what to say anymore, as from the start we have had issues with our speed and conection. At first their contract states 10mbps and uncapped, but then 50% capped if you go over an certain gig per day. That is fine, but now I have a record of our speed from January 2019 and have never had a 10mbps speed. When you complain they at first answer you and then just stop and dont respond anymore(while the problem is NOT solved). This is been going on from the start of this 24 month contract.