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When you purchase a domain, I'm afraid it is not possible to change the domain name afterwards because it will be registered this way under your name for the time period you chose. Also, as you did this more than a week ago, the registration process has been fully completed, so that we cannot do any refund any more.
I'm sorry I don't have better news for you. All you can do now is purchase another domain name with the right name and let the old domain name expire.
I wonder if you might consider keeping your current domain name. Your old domain name is quite long already, and the new one would be even longer. It is not recommendable to have a complicated domain name because people will not be able to easily read it and keep it in mind. I know that lots of domain names are not available any more, but you may want to rethink your domain name and go for a simpler one if you decide to buy a second domain. You can find some helpful information in this Tutorial: Tips for choosing a domain name.
Please let me know if you have any further questions on this.