Reliance Trends — in the billing counter my balance is not returned.

Address:

Cuttack, Odisha, 753014

At reliance trends cuttack, odisha, i was to get return of 1300 hundred as i paid 4000 and in the billing counter the lady told me get the coupan first and when i went back to her and claimed my balance amount she said i already returned, being a regular customer this happened for the first time ever over last so many years i purchase nearly 25000 per year, please help me resolve g this problem, being a regular customer my faith in the brand will ruin as i visit on for customer service but this short of incidence is zero tolerance