Supermarkets conning customers over prices

Supermarkets are at it again, overcharging customers. I found that the price for Doom Odourless was Sh585 at Tuskys but at the cashier’s the price was Sh610.

The supervisor, after confirming that it was Sh585 on the shelf, claimed that they had not got round to changing it to Sh610. Is that not stealing from customers?