Dear Alex,
Many thanks for your recent review. We value all feedback as it gives us a chance to review and improve our service.
Our website relies on customers entering the correct details and checking these prior to payment. You will have also received a confirmation email which will have given the full details of the product and dimensions you ordered. This email is sent to our customers to ensure they have a second opportunity to check that what they have entered is correct. If you had noticed the incorrect measurements at this point and contacted us, we would have been more than happy to refund your costs so that you could then process an order with the correct dimensions.
Even once you had received the order, you could have contacted us to let us know what had happened, and we would have done our best to send you a replacement as soon as possible.
In terms of the cost of delivery, all of our plastic sheets are securely packaged and sent by courier, using a next day service. The courier charges are based on the dimensions and weight and are in line with our competitors. We do our best to keep courier prices as low as possible, and regularly review them to remain competitive and fair.