Maruti Suzuki India — car service billing irregularities

Address:

Chennai, Tamil Nadu, 600106

Dear sir,

Kindly refer our telecon today with you[protected] regarding complaint towards billing of my car serviced by abt maruti, arumbakkam, details of car is detailed below:

Tn 02 au 2102-maruti dzire -
Kindly note last year during 20th september 2017, the car was given for general service and they changed oil etc., and charged me rs. 10, 270, thereafter for small jobs and during service campaign the car was serviced by them without any issues. Recently i got frequent calls for more than 15 times from last month on wards and insisted the car has to be serviced at free campaign conducted by them for rs. 400. I intimated that the car was sparingly used and no need for service, since its speedo is only 61773 kms from 54871 i. E 6900 kms run for 13 months from last service date 20.09.17.
Due to repeated calls from them the car was taken for so called free service campaign today 07.10.18 at 10.30 am by giving job slip without any serial number and date etc., after that the call from them confirms for oil change is must required and the cost will be around rs.3000, then i said ok for service even though i believe oil change not required, to my dismay around 3pm the service adviser told me to pay around rs. 7900 and the car will be sent to my address. I spoke to the customer care person that this is unfair and with out my approval how the amount will be rs 7900 instead of promised rs. 3000, he bluntly told that they have intimated me and i gave consent for rs. 7900.
My grievance is how abt, arumbakkam behave like this without any business ethics or logic and transparency towards its customer. Kindly do the necessary action/steps to avoid such incidents to their genuine customers like me.