USCB Corporation Debt Collection Complaint

USCB Corporation Debt collection department,

I do not know Cont'd attempts collect debt not owed Debt is not mine Tennessee

i order online course for - class, but this was not what i was looking for, so i send all of there stuff that they had send me, after i had paid them a $10.00 dollar fee, to start, so i do n't know why they are trying to charge almost $600.00 dollars now, please help!