BASSFOX13

Hello, So my problem is : I've bought a POD Studio UX2 the last week, just received it today, and when I try to register it doesn't work and this line appears : "ESN could not be verified. Please confirm the supplied USN. ( Error: 523)". ... I'm really embarrassed and I don't know what to do, because I'm sure this product was new and unopened (the packaging was okay...)... So what can I do? Is anyone here who has solved this problem before? Thanks for helping.