Smartphone-enabled DQ-Track not working

In Nov 2014 I app**** for the smartphone-enabled DQ-Track. I told them that I have the Samsung S4-mini. The operator told me that he could not find it on his list of phones that the app works on. I asked him if the normal S4 is on the list and he confirmed. I asked him if the S4 is working on the app would the S4 mini not work? He told me he was not sure. The long and the short is that it did not work. After lodging 3 queries no one has come back to me. They were going to get the recorded phone call to listen if I did not give him instruction to go ahead. Obviously I did give him instruction to go ahead but the operator was not sure if it would work. If he was not sure he should not have sold a product to me that does not work. Because their staff was not properly trained I bought this product. It is not working and I want my money back.