EXTREMELY slow service and *********** staff

On Monday the 30th Nov, I went into the store to apply for a new contract but didn't have the documents on hand so I asked the sales assistant for the shop's email address. I emailed the docs and called them on Tues to check if everything was received and was told that I was given the wrong email address. I sent the docs through again. On Thurs I received a call to collect the device. I went to the shop on Fri with hard copies of all my docs and was told by Clayton that the device was in the shop but I couldn't collect because credit vetting was pending. I was told that he would give me a call on Monday to update me on the application status, which he never did. In fact, I called him thrice, and all three times he was too busy to come to the phone. I called the shop again on Wednesday and was told that the status was still pending because systems were offline, and was advised to wait another day. Today is Friday the 11th and I still haven't received any correspondence from the shop. I am on the verge of cancelling the contract and switching to another network. I also feel like the shop's staff are very unhelpful and have absolutely no respect for the customer