Rule 1 is to never give out any details to anyone who phones unless you know who they are.
Wescot I believe are a debt collection agency and have probably phoned the number they have been given. As it appears that they have dialed the wrong person or number, I doubt you will hear from them again.
So not a scam, just a wrong number called. They will write to the address they have on their records as the last known address of the debtor.
For reassurance, you could check your credit records with Experian and Equifax, both of whom offer free trials.