just had car mot and good news it passed bad news

got home and one monza scuffed . went back and
garage man was fine . didnt pay for mot and told get wheel referbed and give him the bill .
now the other monza on that side was scuffed by me and was going to get a new one £400

because heared if you have one done they dont allways look the same color . dont know if this is true ,but now can have to referbs on one side so you should not see any differance .
were can i get them done am in nottingham ....can you help