Conrad Credit Corporation Charging me 20-40% additional fees when company unable to send me a bill Escondido California

 Conrad Credit contacted me that my maintenance bill for my timeshare was at a collection agency.  I was told that the bills they sent had been returned to the sender.  I was not aware of any bills having been sent.  

Conrad Credit told me that the bill was $762.22, I called the timeshare and was told the bill was $532.14.  I was told that the additional 40% fee was charges from the credit company.  The credit company told me it was my responsibility to contact them to make sure my bill is paid on time.  

Sounds like a scam, they don't send a bill then charge the person extra when the bill never arrives.