Will acknowledge no part in messing me around.

Appling for a GAME card is a nightmare. I contacted Gateway store yesterday to say I was coming to apply for a Game Card what did I need to bring with me? They said I needed 3 months bank statements and my ID. I completed the form and handed in my ID copy and 3 months bank statements. They said it would take 30 mins to 48 hours. I then waited for an hour got no response and went home. This morning I am messaged and asked to contact them. I contact them and they said they don't have my bank statements could I please send them. I said I had handed them in at the store. They then said they would contact the store. I contacted them approx. 6 hours later to ask if they had received my bank statements - they said they hadn't. I then contacted the store and they said they had sent them repeatedly. I then contacted the finance again and they said the store wasn't following up that they finance had received them. I then get a call about an hour ago saying they finally received my bank statements but cannot process them as they don't have a bank stamp. I was never asked for this. How do you get a bank stamp on a public holiday? The store then admits other app's went through without the stamp