squeaking noise from engine when driving mk1 ford focus?

hi, i own a 2001 ford focus (mk1 model) and had an alternator replaced, however since i got it replaced, when driving it sounds like a metal to metal rubbing noise or a high pitch sqeak which gets louder as i rev, it doesnt make a noise when out of gear. i have been told that it could eb the guy who fitted the alternator has broken it when replacing it, the timing belt was replaced and have no signs of abnormal wear n tear. car still drives and not overheating anyone help? p.s i had it fixed when visiting my parents in mainland u.k so cant go back to the deal as he is miles away
 
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