Had a new alternator fitted on the 20th May 24 and an hour after the mechanic left I went out in the car and there is an issue with what seems to be misfiring. Contacted mechanic within hour of him leaving and he said to see how it went over next few days. Contacted them today and they want to charge me £75 to re-attend. NO WAY ! If this was a proper garage I would just take it back there and park it up for them to rectify.