Amobia 4Mb/s speed issues

Upgraded my Amobia Line from 2Mb/s to 4Mb/s in Jan and its been a disaster since.<br> Since the 4th of Feb I've had outage and extremely slow speeds yet Amobia takes there money every month. I've continuously reported issues and every single time Amobia communicated back on \issue resolved\" I responded with proof that I still don't receive my contracted speeds, generally "