Gomechanic Spares - Order cancelled amount not refunded

I ordered GMDCC******,* Bridgestone tyres though Go mechanic spares app via zest money payment gate way on *th january ****and later order cancelled on ** January **** from Go mechanic due to stock unavailability and initiated refund ,still i didn't see refund not reflected in zest money app and my account too.When ever i call or reach to Go mechanic service support ***** ***** they simpley requesting one week time from last one month getting same responce but no use and asper the previous commitment date today *th March **** i called them again repeating same one week and provided new date as **th March **** for refund please help me to get the refund