Poor service

I made an online order on the PnP website on 27 April 2026,I paid twice as I received emails saying my order is reserved in the cart,they had a 1 day special so I made sure I pay even after my payment was successful on their side,yesterday I saw that my items were still in my cart,when I called PNP they said they had a system glitch and would give me a 100.00 voucher,I disputed this as it wasn't even close to covering the items I would've received on their web only deals,the lady confirmed that my payments were voided on their end,I told her it's not my fault,I want the items at the Monday price,I still haven't received any feedback from them after sending an email,I also haven't received the voucher.