Clearly displayed at the point of sale - Frozen diced lamb, was £2.89 per pack, offered at two packs for £4.00.
After queueing at the checkout for over 20 minutes the amount scanned and charged was at the previous price, ie: £5.78.
To rectify the overcharge I had to join another very long queue of disgruntled customers at the inadequately manned 'customer services' counter to gain the refund due. Every customer in that queue was there for exactly the same complaint of overcharging on the particular items they had bought. In every case they had been charged the original price at checkouts instead of the offer price displayed at each point of sale. A further wait of almost 30 minutes had to be endured for service.
It appears that the computer information used within the store is inadequate and not robust enough to confirm true pricing details to be shown and charged at checkout tills. The problem would seem to raise the question, "how accurate are all other prices displayed" or are many of them reliant on the same system that charges wrongly for reduced items?
I imagine that many customers may not thoroughly read through the long receipts issued following payments and therefore Tesco is able to gain quite significantly from the errors made.