POOR SERVICE FROM RAPIDNET

I was promised telephonically when I signed up for a 10mbos Line that my speeds would not drop beyond the 6mbps mark. I have been have issues with my speeds since March last year. Every time I query speeds they tell me they are switching me to a new Tower. I have multiple tickets to prove my queries. Tonite I tried querying my speed as i rely on streaming for telivision. Support who are supposed to be available 24 hours keeps going to voice-mail leaving me with a under 2mbps line despite me paying 399 for a 10mbps line. They are very quick to disconnect you without investigation and any correspondence if ure their is a problem with the payment but are useless in sorting out speed issues.