Mahindra And Mahindra — car service delay more than 20 days

Address:

Surat, Gujarat, 395006

My car services delay more than 20 days. My car mahindra xuv 500 given to service station president motors, surat gujarat for change in gear box, they give me time for 10 days bust today after more than 20 day, till they says for waiting for few days the repairing are not done.
Please take necessary action and given the service in proper time.
Very poor level of service please do needful as early as possible.