I am having the worst after service from Atterbury Motors

I am having the worst after service from Atterbury Motors. A noise on my car which was there 1 week after delivery of the vehicle was never fixed entirely and now that I am hearing it again, they say it is wear and tear. I received my car in January so what wear and tear can there be in a matter of 2 months. Do not fall for their promises and do yourself a favour and insist on a full diagnostic report before purchasing. Promises were made by a sales person who no longer works there and now the manager and the after sales team not assisting.