Domino's Pizza — regd. late delivery cashback

Address:

560037

Ordered on 28oct.
Got pizza about 1-1.5hours late. Store person told that cashback will be reflected within 15days. It didnt reflect.
Again called store on 16nov, 18nov, 19nov for cashback, they told next time when you order, we will give 300/- off
Now store manager (Kavitha, outer ring road, marathahalli, bangalore) is denying and saying we cannot give you cashback as well as discount.