Frequent wrong pricing by Checkers Somerset Wesr

I've been having several issues lately with Checkers because of items wrongly priced. When I complain one has to wait until some manager appears to sort out the problem, but this is time-consuming for the client. If it’s just one item I often just leave it and walk away. Today was a case in point. I saw a Prosecco marked for R100 and decided to buy it for a special occasion. However, at the till the price escalated to hundred-and-sixty something. I decided to complain and a service consultant with a large banner wrapped around her body was called. She said she will go and "check" the price. but I said I'll go with you. Sure enough the R 100 was indicated directly underneath the bottle. She then said I should stand in the queue and she will get a "manager' who can change the price. Eventually I got to the till, but here was still no sight of a manager. I had waited at the till for probably the best part of 15 minutes, and I just said "you're wasting my time" and left without the Prosecco. Checkers is the closest shop to where I live, so I often buy groceries there. However, if they don't do something about more accurate pricing I will just skip them.