I am receiving harassing calls from XXXX which claims to be Contract Callers, a debt collection agency. They say I owe XXXX XXXX over {$2000.00} and they want me to make a payment. I have a XXXX XXXX account and my limit is XXXX what they say I owe and I pay my XXXX XXXX card minimum payment every month. Furthermore, I check on my credit report every month using XXXX XXXX and there is no such outstanding debit. 

Please help me. They are calling my cell phone while I am working. How can I stop these harassing calls? 
