Bad service

Hallo Peter<br> <br> I bought a car on the 24th of December 2014, and interior was not clean and the dealer was aware of that. The dealer adivised me to bring back the car in January for valley, of which that was not a problem for me. <br> <br> Early January I took my car back to the dealer for valley as adviced . Then the manager told me that my car will be ready in 3days. A day later I realized that I left my daughter's iPods in the car and I didn't worry about that because I thought my car was in good hands.<br> <br> 3 days later, I went back to the dealership to collect my car, then I realized that my daughter's iPods were not there.<br> <br> The manager said he'll contact the valley company concerning my lost valuables. I never heard anything from him until I went back to the dealership a week later, the manager said he can't do anything until I can produce my prove purchase invoice. <br> <br> I emailed them to the dealership on the 18th of March 2015. I made a follow up 3 weeks later , they said they still waiting for the feetback. I called the dealer and I Spoke to the dealership manager, he said he has nothing to do with my lost items, he doesn't sell iPods he sells cars.. Please help me to get my stuff back