Who called from 3367706461

It is the number listed fr John F. Williams, Payment Officer, for what is probably a scam operation.

I keep getting phone calls from a gentleman stating I need to cash a check that was sent to me on Feb. 15, 2010. The check was on HSBC bank and it is supposedly a mystery shopping job.
I will not cash the check but he will not stop calling either.  Do not know what to do but please beware of this company called GCF Careers. They hide behind a "blocked" number and are calling on my cell phone.