Mahindra And Mahindra — Service cheating

Address:

Kandathil house nedumon p.o ezhamkulam

Today I have send my vehicle marazzo for periodical service at near by service center. at first they have given me a job card and estimate bill that company has recommended for 30000 km service. I have seen and approved.
But after completing the service they have charged me extra by replacing costly oil and extra quantity also. Company has recommended only 5 ltrs oil but they charged me 6 lts oil. This is how they are cheating customers by replacing unwanted parts.