My number used to make calls I have not made

[Teytey]

I keep receiving calls from people saying along the lines of "oh hi I missed a call from you, I'm returning the call" I actually rarely make calls and certainly haven't called any of these people
My phone doesn't show a record of the call, but I've had at least 10 calls from people "returning my call" and some people get annoyed and think I'm lying. What's going on? Anyone have any idea please? With thanks

[MI5]

@LAM1 

https://www.ofcom.org.uk/phones-telecoms-and-internet/advice-for-consumers/problems/tackling-nuisanc...