Eye Vibe / skin element DAR Waterfront & Associates Sent me to collection bureau after cancellation and return of product

 I had originally ordered this product and had a bad reaction from the products. I called the company to discontinue any further mailings and to obtain the return address. This was in November of 2016. I returned the product, was refunded and assumed that this case was closed, until... I received a collection letter in the Mail today June 13, 2017 from DAR Waterfront & Associates looking for payment. When I had originally placed the order and returned the product, I was living in another State. I had moved this year 1100 miles from my old residence. How they obtained my new address I want to know and why do I owe for something I was refunded!