Price mismatch scam

This is third time this is happening with me in super market. (Not in the same one)

I went to this newly opened super market to buy things.

I was trying to buy refine oil for which the price tag shown in the mart was 147 and during the bill generation it showed 163. When i confronted the manager he just asked the cashier to return the remaining amount.

He didn’t even take the tag out. I would have attached the images but it’s not allowed here.

Please always match the price in the bill with the tag shown in the marts.