Hi Mark,
We are sorry to hear that you were not happy with our product.
To address your concern, these are GU10 spike lights. No transformer is needed, they connect directly to mains (as described in the product description).
For returns - it is fairly straight forward. We simply ask that the lights are returned as new, in the original packaging in a saleable condition. (In summary, how you would expect to receive the goods, if we shipped the items to you).
Best regards
Chris