This shelving unit does not work for me, first its half the size I expected, second its cheap materials hardly worth half of what I was charged, thirdly its difficult to assemble because the sliding panels do not fit securely in the groves and the locking connectors unlock on their own during the assembly process, Though Im sure I could eventually complete the assembly, but why bother since is a total disappointment and the time would be better spent unassembling it for return. How do I return it for a refund