CRM account access blocked after upgrading subscription

CRM account access blocked after upgrading subscription

Hi,

I have just upgraded my account from the free edition to the professional edition and immediately after submitting my card details I get the following message whenever I try to access the CRM section:
Sorry! Your account has been disabled. Your Zoho CRM account has been disabled and you will not be able to access it. Please contact your Zoho CRM Administrator for the access.
This is obviously very worrying after I've just paid for a subscription and I'm now unable to access it. Please can anyone from Zoho help resolve this issue?

Kind Regards