Hi Sheila, I am a fully qualified electrician and I can only apologise for what has happened, I understand that you must be very upset in thinking you have been taken advantage of, have you spoken with the electrician to see if you can resolve the issue, also, I cannot comment on the work that was done but, a plasterer isn’t an electrician and shouldn’t really be commenting on what work was carried out unless he was there. Different electricians have different rates. If the work was only tightening a screw, it may have taken him a while to find the fault and also, you pay for their experience. He may have been very fast and experienced, some people take hours to find basic faults and experienced electricians can take minutes. Electricians should be paid for their experience and professionalism. I am sorry you feel let down by a fellow electrician and I hope my reply has cleared up a few issues your had.