Same 7259 XXXX number called twice, both times said my full name and hung up as soon as I asked who was calling

They keep calling on phone starting with (02)7259 XXXX. after I said wrong number

02 7259 nnnn several numbers numerous calls no messages, pain the proverbial!!! Blocked and still blocking wth

Very hard to understand. Apparently I had expressed an interest in investment/cryptocurrency at some stage (nope). When I said we were retired and not interested in investments I started to get questions about previous employment and how long etc. Hung up and blocked the number.