Reliance Mart — Delay in fittin of ac and no response to phone

Address:

Chittoor, Andhra Pradesh, 517501

I bought 1.5 ton AC Panasonic which got delivered at 5 PM. For fitting of AC I'm not able to contact the concerned person. The no. Is busy for an hour and then it's switched off. My EAN no. Is[protected].
I was calling the given mobile from nearly 3 hrs. Theres no response. This is very weird and reliance people have said by Monday they will fit at any cost as I paid the bill in Thursday itself.
This is very worse behaviour as they are wasting a lot of time of the customer.
I need a fast and accurate response