My landline in not ringing

phone has always been fine . I tried to ring your 1765 number  did not work just so you know . Ive not been impressed with the you landline service ever sine the change as it  relies on internet working . which in a power cut would not , my wife i disabled and we had a phone upstairs this could be used if she was up there ,  but was told extension / splitter cable do not work she has to carry a mobile around, not ideal when you really on crutches to get about . now we  have this problem as well it always just fine when it was the old system