If you are not satisfied with any product you buy, you can always contact NHT Global support at: http://nhtglobal.com/
Excerpt from the policies & procedures:
NHT Global offers a 30 (thirty) day, 100% (one-hundred percent) unconditional money back guarantee on products sold to all retail customers. Every NHT Global distributor is bound by his/her Agreement and the Policies and Procedures to honor this guarantee. Prior to the completion of any retail sale a distributor must make a verbal disclosure of the right to the unconditional guarantee. If a retail customer is dissatisfied with any NHT Global product for any reasons, then the he or she may return the unused portion of the product to the distributor from whom it was originally purchased within 30 (thirty) days for either a replacement, exchange for another product or a full refund of the purchase price of the product.