PharmEasy — cashback not credited

I purchased medicines from pharmeasy and paid rs.547through paytm on 01/01/2019. Order id is-m6510912, promocode "dec20" applied. According promocode pharmeasy processed a cashback of rs.-109.40 in my paytm account on 01 jan.19, transaction id is-[protected] but paytm hasn't credited the cashback amount in my account. I complained in paytm helpline, uploaded the bank payment to paytm rs.547and provided cashback transaction id. But paytm hasn't paid my cashback.