Not keeping to advertised price

I started to shop on line with PNP this week. I place my first order and then find out the hard way that my gift card(from PNP)is not an accepted method of payment. Fine, then I go and place and order: ***, for my wife to collect, since they do not deliver to us. When my wife goes, she is informed that there is no order for her to collect. She called me I was upset and emailed PNP, no response to date. I then replaced the order under the persons advice that she spoke to as she advised that it might have been a technical issue that the order was not placed. My wife then went the following date to collect new order: ***, only to be told that the same has happened to this order! Once again my order was not there and was never placed, this is strange as my wife has BOTH email confirmations and it shows in my inventory, again I emailed to speak to someone, but as always, nobody gets back to me. This is pathetic on PNP side and I demand that someone from management contacts me to sort this out ASAP!!!