Having more than a few years in the mechanic field at Ford and Chevy delerships I can assure you that that wheel bearing had not been replaced. The mechanic performed what is known a "flat rating" on you truck. Getting paid for work not performed. I would have laughed so hard if some moron told me the grease was reused, that is nuts. You probably talked to some pimple faced kid on the service diveway. Contact Ford directly and voice your problem.