Picknpay customer service 0/10

Customer service levels at picknpay branch level have definitely dropped. I shop regularly at their Mulbarton branch in Johannesburg and nearly every time one or more items scan wrong at the till .A few weeks ago on a Sunday afternoon, over a thousand items incorrectly read R 1.00 on the shelf ( digital prices ) and at the till and they were quick to announce repeatedly over the store intercom that it was a head office error affecting stores nationwide and it was being addressed and customers must please not demand or believe that the R1 was the actual price . I unfortunately was stuck in that check out queue for 2 and half hours as each customer had to have their checkout individually rectified by a store supervisor and that was after they had closed the doors to prevent more incoming customers. Anyway when I got home I checked my till slip and found I had been incorrectly overcharged, which after two hours of phone calls and two visits to the store I managed to get the goods returned and refunded in full . That occasion both head office customer service and the store supervisors told me they would rectify the faults . So imagine my happiness when this past Monday and yesterday again the same goods ( which are advertised on special promotion ,one I might add has been ongoing for the past few months ) we're once again charged at the normal higher price ...both Monday and yesterday and the response both from the cashier and the super was as if I was an inconvenience and this wasn't the only item incorrectly scanned , items on their pamplet/brochure ( a 5 liter sunfoil oil advertised for R 165 - shelf price R 235 ) Being scanned at R 235 and the response when we said it was wrong...' let's see the date on that ' ,hey they sent it to me on their picknpay whatsapp group ,besides hard copies at the store entrance...and really ? Are your staff not up to speed with the prices ? Am I the first customer to of purchased that item this week? Or am I one of the few to query it ? And we were told weeks ago this overcharging on the promotion items would be sorted..so how many customers have been overcharged and not noticed or bothered to go back