More Supermarket — Product price and billing price is different

Address:

Mudichur Road, West Tambaram

I notice that the product and bill prices are not the same and will often need to be cross-checked, it's the third time in 6 months in the same branch, and how many customers will spend time cross-checking the bill with the product and they indirectly lose money because of their technical/process or people flaws.

Even after multiple warnings in the store, it looks like the right process is not in place.