Unsatisfied with product

I bought a Sorbet face and neck massager at Clicks and obviously opened the item to use it. The unit switches off after a few minutes even if it was charged for a few hours. It has not improved the condition of my skin's elasticity and doesn't seem like other brands. It's weak. I Googled to see if there are any instruction videos on their website or on YouTube. But found none. I'm not happy with my purchase and Clicks apparently only accept returns if the item was not opened/used. What do I do in this instance? You can also not lodge a complaint with Sorbet themselves, you must take the item to the store you bought it from.