JFT 967 MP sandero auto pedigree ermelo

I bought my mom a used car at ermelo auto pedigree.we looked outside and inside and they start the engine so we can know even how it sounds and we were happy just like any customer would do and check when buying a car. We were also told the car never skipped service plans and they showed us the latest stamp showing the last time the car went on service. We drove the car for some time and it showed an engine light and it was close for service so we took it for service,they discovered the car skipped service and that costed us unexpected money to be paid upfront before we could take it home. The very same day we took the service book as proof and showed the car dealer and they admitted it was their fault that they did not check and told us lies that it never skipped service. They said they will refund us the extra money we used which was stipulated on the paper proof from the service centre. We waited for a month and they never came back to us. So we went there again to find out what was delaying them and they told they forgot about us. We gave them another few weeks but we were not contacted. We went to now ask for the manager aswell and he saw everything and said he will send an email to the right department,so asked to be copied to that email and i never received it. I went back alone for the 7 time and i was told email was sent but they forgot to copy me again. This was a second car from the same dealer of which the first car had a battery problem. They make buying a car from them a living hell situation