I can remember many years ago booking return tickets from Derby to Southampton online with the old Qjump company and these didn't arrive. It actually turned into a very interesting situation but very worrying at the time.
I had always been used to tickets being booked online arriving within a couple of days by first class post and also the money is taken from your bank account within a week even if you are booking many weeks in advance. This time the tickets didn't arrive and although I had received an email of booking details including reference number no money was deducted from my bank account. After a few weeks I contacted Qjump to explain the situation anbd they insisted that sometimes tickets weren't dispatched until a few days before travel. I just couldn't get them to understand about the money not having been taken out of my bank account. I tried to explain this situation in a series of phone calls during the following weeks but Qjump looked up my booking reference, told me that there was no problem, and kept insisting my tickets would arrive the week before travel.
On the day before travel they hadn't arrived so I rang Qjump who said that they must have been lost in the post and they promisised to arrange for me to collect my tickets at Derby at 6.30 am the next morning (Saturday. It was approx a 7am departure. When I arrived at Derby they knew nothing about my tickets but fortunately they were very helpful and contacted Qjump, which resulted in them issuing me with some handwritten tickets complete with my seat reservations.
When I got on the train, both on the outward and return journeys my seat reservations were there and so the journey had definitely been booked. Interestingly Qjump never did deduct the money from my bank account and so I had a free return journey from Derby to Southampton. Obviously my tickets were showing as being booked on their computer, yet the process of charging for them, printing them and posting them to me was not completed. It's a good thing that I arrived very early at Derby station on a dark winter Saturday morning and also that the staff at Derby were helpful.