The official ebay GSP procedure for GSP queries is to ring customer service and ask for the matter to be referred to a GSP specialist. They should promise you a call back within 24 hours but will not usually transfer you directly. What they call the 'frontline' operators cannot answer GSP related questions, but will often (it appears) try with information related to non GSP processes, which just serves to muddy the waters.

This information is a slightly paraphrased quote from the EU head of GSP. A new information page specifically relating to 'What to do if things go wrong' may be in the works for UK users, but the UK GSP is a tiny tail on the huge US GSP dog and I don't know how much input the UK team have on the US help pages.

The main problem with this system is that neither the caller or the operator will know that they need to ask for a GSP specialist and the caller may not even know they have a GSP problem.