Grant & Weber Debt Collection Complaint

Grant & Weber Debt collection department,

Medical Disclosure verification of debt Not given enough info to verify debt California

After receiving a debt collection notice on a bill from - -, I called the collection company to dispute this as I did not receive the bill. I was told by the collection agency that I should contact my insurance company for any back up regarding this bill. I called - - after getting the number online, and spoke to a -, who could not provide me a copy of the bill and sadly told me to contact the collection agency with whom would not provide me any paper work other than what is on the collection notice. Since this occurred yesterday, I have had to block harassing calls. Please help, my health can not continue to deal with this in such a terrible manner.