Eastern Railway — ipad

Address:

48 KABI SUKANTA SARANI, FLAT NO.-7, SHIVAM APARTMENT, 2ND FLOOR, KOLKATA-700085, Kolkata, West Bengal, 700085

My daughter dr abhipsa dey purchased one ipad 6th gen 9.7 inch with stylus.
Sales personnel sri sukhen mukherjee & sri souvik mazumder forced us to pay through paytm and assured cash back.
After receiving cash back of rs 4000/- (Four thousand only) they again forced us to redeemed rs 2700/- (Two thou seven hundred only) in favour of them.
The entire dealings was hide and seek.
Mr suresh sharma incharge was there but did not act accordingly.
How paytm cash bach will be the property of ezone?
What is the tie up with paytm?
Why we were forced to pay by paytm not in other online mode?
Does their intention was inclined or some hidden benefits to them.
Why bill do not have proper price reflection?
Please enqure in to the matter at an earliest.
Thanking you
We remains