On the very rare occasions this happens, it’s almost always because you didn’t return to the website after you completed the payment process via PayPal. Such problems are easily and quickly fixed. The best thing to do is to contact technical support and let us know of the issue, and we’ll get back to you as quickly as we can (almost always within 24 hours). Please don’t take any other action as this just slows the process down.
So if you have paid but haven’t been able to complete your registration, contact technical support and know that we will prioritise your query and get back to you ASAP. We’ll get the problem sorted out quick smart!