I can certainly understand the need to keep things affordable. But can I be really honest with you? The bottom of that page you linked said the 2 cartridges are the equivalent of 30 cigarettes. I'm sorry, but that just isn't true. A cartridge *might* and I mean might... be about the same as 5 cigarettes, if that. Luckily, you didn't spend a whole lot on this device you got - unfortunately I've seen kits that sell for over $100/USD that are pure crap.
Being that you are in the UK, I believe Totally Wicked has a UK location as well as their US location. They are a good solid company, and been around for awhile and sell good products at reasonable prices.
I know right now you are probably getting a bit peeved that you bought something that doesn't work. A LOT of folks started out this journey with less-that-good devices and paid a helluva lot more for their mistake, so don't beat yourself up over it. Just do some research, ask questions here, let us know what the important things are to you (vapor production, device style, how much you smoke, etc). There is a boat-load of folks here that will help you find something you will enjoy from a reputable dealer at a price you can afford.
Most important thing Jay - don't give up! You have made the very wise decision to head down a path of healthier living. We're all right there with you and will help you any way we can!