Attempted to book my first shop and booked the wrong date. The shop has been paid for and I've emailed the address at the bottom. however, there was no response. How can I undo this or make contact with the contractor?

Thanks Norm. By contractor, I meant the scheduler. I was so excited I chose the wrong date. I have not completed the shop. It was for the 7th but I selected the 11th. I will still go and contact the scheduler to see if they will issue a form do I can complete and at least give my opinion. I realise my fault so I'm not expecting compensation for something i messed up. Thanks on the advise.