Unsatisfactory service supply from Mweb.

Ive been struggling with intermittent ADSL line speeds for more than 6 months. The last still active complaint was phoned in on 31 January 2018. Up to today the 26th of February 2018 the fault of my line has not yet been resolved. Every time I speak to a consultant at the callcentre the assure me that they understand my frustration, in actual FACT they do not have any idea of what my frustration is. First of all I can not see or understand how it is possible for a fault to be active for this amount of time WITHOUT ANY ACTION been taken. Secondly how is it possible that they just do not take responsibility for a line that I rent from them. Web you are still suppose to supply me with a service. Or at least supply me the service that I PAY for.