Unfamiliar “trusted number”

An unfamiliar “trusted” number has been sent to a number which Is not mine. A few months ago my phone was stolen and a new number was inserted which I realised when I checked it on “find my iPhone”. The trusted number which now appears ends in the same digits as the number that was inserted into my phone.

I am worried my data is in danger. What should I do? It does not appear on my Apple ID account when I login so I can’t remove it.