I received a telephone call from a man purporting to be from BT. He gave me his name, employer ID and a reference number.

He said he wanted to see if my router was working, but I told him it was not convenient and he arranged to ring me back.

This he did and I spent over half an hour entering various characters on my computer as he directed.

He then told me there were 4,600 faults and that he would send an engineer the next morning. The engineer would install a new router, carry out security checks and arrange for compensation of £256 via direct debit.

The call then ended abruptly.

TK, West Sussex

The next day you contacted BT saying the promised visit had not taken place. You asked if you should continue to wait. BT took more details and then said the caller was a scammer.

You are 81 and do not have internet banking, which seems to be why you had a narrow escape.