I might also add, to the validation letter posted, that you demand competent proof from a junk debt buyer that you are contractually obligated to pay them (if you "debt" is still within the statute of limitations).
As to the Greenville, SC BBB, it is a waste of time. They are in bed with Sherman/LVNV. They provide quite a lot of jobs!
To get LVNV/Sherman off of your credit report, unfortunately, you'll also probably have to deal with them. When you dispute to a credit reporting agency, such as Experian, they only send an email to the collector. The collector simply says, "yes we have this account, and he/she owes it". The credit reporting agency then reports "validated".
I'd like to remind people, that in many states small claims court is a very inexpensive way to sue for violations of the fdcpa as well as the Fair Debt Reporting Act.