Metro Cash And Carry — high amount billed in one product

Address:

Indore, Madhya Pradesh, 452001

I had purchased various items from metro indore on date - 02 dec 18, in which one product was billed higher than price tagged there. (Tagged price-17.50 and billed price-32.50)
After lodging compliant even twice in toll free complaint, they told that your difference amount eill be returned yo you shortly, but even after 15 days it wasnt resolved and after visiting the metro store, i was told that it is not possible as the price rate told by me.
Bill no - 0/[protected]/010542
Article[protected].
Kindly sort it out.
Is this the way of behaving with customers. Every time i face such issues from metro indore.