Paytm — promo code expired

Address:	Sonipat, Haryana, 131001
Website:	paytm.com

On 18/10/2017 i ordered a product on paytm (Order id - [protected]) with a promo code applied fut1250 (Which give me a promo code fumwgn7wckvnww to be applied on electricity bill). This promo code is valid from 08/nov./2017 to 08/dec./2017 till 10:05 am. When i applied this promo code on 04/dec/2017 it did not work. Then on 08/dec/2017 at 10:00 am i again tried to apply that promo code but same error appears then i send msg to paytm assist about this issue with screenshot of error shows but till date no satisfied response from them & when i called them and asked about my issue they said this issue already closed from our team. They also changed the expiry time of promo code from 10:05 am to 4:35.
I am totally frustrated and spent lot of time with them on call.
Plz help me in this issue.
Query ref. No. 45306676