I've received a letter from Virgin media telling me my account has been locked due to 'suspicious activity' and that it's possible 'unauthorised persons have accessed (my) account'. The compromised address is my wife's. The letter goes on to recommend running anti virus scans and changing passwords which I've done.
The thing is that this is the third such letter I've had this year, each time it's the same email address cited and each time I've taken the recommended security actions so what is going on here and what should I do? The letter does not give details about the suspicious activity saying only that it's 'not as a result of a breach of our systems'. How can I find out exactly what the suspicious activity is?