collection agency harrassment

I recently had a call from a collection agency I think and they asked for someone with a similar name incorrectly pronounced. I asked who was calling but they would not say so I refused to talk with them.

Assuming this was a collection agency, the only thing I can think this would be in relation to is that I left my previous job before a relocation agreement had expired, and I believe the company thinks I owe them money, however they were closing down due to a joint venture, so I left before they started laying people off.

The question I have is;

Can the collection company effect my credit rating for something like this, when consumer credit / debt is not involved? Should I speak with these people?

I did seek legal advice before leaving the company and was told I would have to be taken to court before I was forced to pay any of the relocation costs back to the company, if that was what was ordered by the court, which the attourney thought would be unlikely due to the circmstances.

Thanks

Dan