Orange told me my local mast was not working and that they would fix it, a month later it was sposed to be fixed but wasnt, then they told me coverage was good in my area but would send some fella out to check outside my house, which was an epic fail lol,eventually they gave up and terminated my contract admitting there was a problem at thier end.
Complain, complain and fooking complain, make them understand they are not perfect and do have problems and its not your fault for being misled by some poxy prety coverage map that they put up in the shop or on the net to say your signal will be great, when its crap.