Just call the shop you got it from or the manufacturer and talk to them about it. A handful of people have reported similar problems here but I've got a flavour shaker (had it for more than a year and use it semi regularly) and it's fine, no cracks, nothing.

And trust me, you'll probably make a worse investment. Have you never bought anything that wasn't quite right when you got it home? Although most products are quality controlled some items that aren't right get through, that's why manufacturer's have returns policies. For example, I've had to return about 5 things to IKEA because of manufacturing faults, but I don't think IKEA sucks and I don't think their products are inherently badly made nor am I bothered by their advertising.