Just in case your line has been crossed with someone else, dial 17070 and the AVR should read out your number , if it matches what you expect , then as already explained, scammers can make their calls look like any number they want , but that doesn’t affect you as far as billing ,just the hassle of answering calls from people , that return the scammer call , if 17070 reads out a number you don’t recognise then your line is crossed with someone else , and obviously calls intended for that number would come through to you, if that’s the case you need to report the fault.
