Pick n Pay upsettingly poor and somewhat ****** service!

My husbands company(Grandmark International) had a collaboration with Shell and Pick n Pay where he won vouchers through a competition they(Grandmark International) ran. He received 10 vouchers (R500 a voucher) we had taken them to Pick n Pay on Nicol today(26 December 2022) and been informed by the company that we should speak to the store manager to redeem. On speaking to the store manager on duty we were completely dismissed, we were asked where did we get these vouchers and where were the Pick n Pay vouchers as if we had ****** them. We obviously couldn't draft these emails and voucher wicodes out of thin air. She further then told us she couldn't help us since it was a public holiday and she knew nothing about these vouchers, she didn't even bother to attempt to process at least one voucher to see if it would go through. We eventually found ourselves at Pick n Pay clothing Ferndale Mall on Republic Road, there the store manager(Tinyiko Makuubela) and cashier (Wendy Mbhatha) offered to try one voucher to see if it would be processes which by no surprise had gone through. We had even done our groceries at the Pick n Pay Ferndale where the store manager had processed our entire grocery cart which even though took some time she did with a smile even though there were a few issues but nevertheless had been resolved but still done. Pick n Pay on Nicol your customer service was utterly and completely disgusting. I would never recommend a shopping experience there ever. You'd actually receive better service anywhere else but there! To be told "I'm not saying you just somehow got these vouchers" already said alot which actually meant thats exactly what you're saying! I plan on taking this up with Grandmark to pull business away from Pick n Pay which in actual fact is an amount of at least *** staff over 8 stores nationwide!