HDFC Bank — Cash back not received

I have purchased 2 i phones one i phone 11 pro with transaction id [protected] amnt 99900/- on 5th jan 2020 n 2nd i phone 11 with transaction id [protected] amnt 69887/- on 2nd feb 2020.. As told by them i will get cash back of rs 6000 per phone within 120 days.. But till date i havnt received cashback for both the phones.. Now its already 120 days n i didnt get the cashback.. I bought both these phone from imagine elante mall shop no 242 plot no 178 industrial area phase 1 chandigarh 160002.

Is this to fool n cheat the customers by hdfc bank... Will have two credit cards of hdfc but now i m thinking not to use these cards anymore n will definitely tell others not to use cards of hdfc bank..

Kindly help to get cashback as early as possible..