Panasonic — Charges claimed after extended warranty (Ewc) done

Address:

Kolkata, West Bengal, 700028

Purchased 2 ton split ac in april 2016 from great eastern appliances, dalhousie. Paid rs 12000/- for ewc for 3 yrs in may 2017 through authorised serv centre zen world, from kolkata - 700028, w. Bengal, india.

I booked a call on 8th june 2017 as ac was not cooling. Technician from zen world says gas leakage. Gas will be filled the next day, i. E. On 9th. When i called serv centre zen world on 9th, they say that i have to pay around rs 2550 for charging gas + their service charges. According to zen world, all services have to be paid within three months of doing ewc.

Is this the system? Panasonic help centre could not provide any info on this. Then what is the meaning of ewc?

Kindly provide an authentic reply / solution to this as we are suffering in this summer heat without ac.