Caller: Elizabeth?

I have had approx 20 calls from this no in the last couple of weeks, often 2 or 3 times in a row. It is an older sounding lady & she usually insists that she is returning my call, or that she is trying to contact some friends of hers (when I tell her I don’t know anyone by those names. She says she doesn’t know anyone by my name!) One time I tried explaining that she has called several times before & that she must have the wrong no, so she got angry & told me to just cancel her booking then! I worry she might have dementia or something 🙁