Renault Tygervalley

I took my car for a service as before and had some things I requested they look at for me while my car was there. I got a call asking me if they can repair chips in my windscreen they saw which I never did. I said both thank you as I have insurance for that. Not long after that call I was told I would be charged for a diagnostic test to see the problems. As last time I was told I would be charged diagnostic test but my car was due for a service anyway they said I could bring it and they would check it out which they did and I was not charged anything except for the service. Now this time around im being charged and feel that they trying to make money out of me as I waited for service time again and now I'm being charged extra. Im very unhappy about it and will not be returning to Renault Tygervalley ever again!