Hathway / Gujarat Telelink [GTPL] — refund not received even after 4 months

Address:

C-301, Verona Greenwoods,, 390021

I had applied for a new broadband connection during the month of sept 2019 and had paid rs 1500 for 3 months subscription.
Gtpl agent mr. Kalpesh parmar had visited me and i had paid him the amount for which i had received the receipt (Receipt no. 66835)

Till date i have not received the refund amount. Whenever i am trying to call mr kalpesh, either he is not picking up the phone or he will tell that he will deliver the check.

I want my refund as it is more than four months since i've paid the amount.