Wheeeee done it ...
Went to billing first of all got the run around again (they offered xxl for a pound less than I am paying with £30 'installation', then xxl for a pound off no installation) tempting but...
Called disconnections and put it to them I wanted what they are advertising on the internet £20 XL + £11 phone ... and thats what I now have
Thank you all for your help and advice