Written notification about debt: Debt collection

I have called the company and attempted to obtain information pertaining to the original date of service, the location of the service, who the service was provided for, anything. They were unable to provide anything at that time. I disputed this on my credit report as well. The company has been unable or unwilling to provide anything verifying the original debt before it was purchased by their company. Additionally, at this point, I dont believe they should even be pursuing payment on this account due to the age of the original debt.