Update regarding this post.
Having got my refund from a very reluctant seller whose auction says item located in the UK and ships from China. eBay saw that I was in the right and issued a refund today.
I opened the casing to find out what went wrong with this charger and found the component that blew.
I removed the damaged component to see if I can perhaps find a replacement and possibly repair this charger. The component looks like a large resistor used for high power situations. If any of you out there has some knowledge of electronics could possibly identify this component and where I might be able to get it from would be helpful.
Many thanks.