HELP!!! Verizon Wireless using Diversified Consultants

[sdl173]

I recently did a credit check and noticed that Verizon Wireless has a collection for $145. I called to resolve this and they gave me the number for Diversified Consultants. I called them and told them that I would pay the debt in full if they could remove the collection from my credit report. They proceeded to tell me that they cannot do this since they did not buy the debt from Verizon. They stated that Verizon contracted them to recover the debt. They are saying that I owe $175. The extra amount is for their collection fee. I was wondering if there was any route I could take to have this paid in full and have it deleted off of my credit report? Any help would be greatly appreciated!!!