Shocking speeds and service from Home-Connect

I'm on a 100Mbps DOWN/100Mbps UP connection but my connection NEVER reaches that speed, not even half. This is for both local and international. I'm getting charged for 100/100 every single month but Home-Connect fails to provide the speed. I have logged calls but nothing improves (e.g. Frogfoot Ticket number 454064). This is in addition to constant reboots of router and CPE device as service constantly cuts. All the Helpdesk is capable of is to tell me to conduct tests and send results but it's 6 months now since signing up with Home-Connect and nothing has improved!