Terrible service - Check your slip at Checkers Cobblewalk

Checkers Cobblewalk - One always have to check your slip before leaving the store. On Saturday I've bought some items and also a bottle of wine which was R10 more expensive than the price marked on the shelf. The cashier had to ask for a Manager to void the transaction. I had to wait for more than 10 minutes for someone to assist. The Sales Manager Sam, eventually showed up with a terrible attitude and rudely told me that he was assisting another customer. I can understand that, but why do they only have one manager at the Store. Please ensure that your prices are correct as displayed on the shelves.