Voltas — AC Service not provided properly

Address:

620003

I had purchased a Voltas Vertis Premium 1.5 ton AC model last year on 24/4/15 from a dealer m/s Sathyar, Chennai. Last year I had availed the 1st free service after six months of purchase as it is provided by the company.
I had moved from Chennai to Trichy due to my Job transfer and I wanted to avail the second service for AC and registered the ticket with the customer care and the number is [protected] on 17th april 2016 and till now the service is not done. It is going to be almost 10 days and the TAT they tell is 24 working hrs which should be 3 days. So I am really dissatisfied the service of the company.
I would like to know how such a big brand company like VOLTAS is functioning with such disgraceful working culture where a customer is made to wait for 10 days for a service which is promised in 3-4 working days and even I tried to contact the service agent office where they don't even pick up the phone.