• I purchased clothes online, paying for standard delivery
• They did not fit, so I took them back to the store
• I was refused a full refund (including delivery), even though it is a legal requirement (under Customer Contract Regulations) and is explicitly stated on the Debenhams website (which I showed to the people in store)
• Spoke to two supervisors, both of whom refused to process my refund
• Emailed customer service, but no response for a week
• I have reported them to Trading Standard Office and have started a case using Resolver

Resolver (search for "resolver complaints") is a free service recommended by Martin Lewis of Money Savings Expert. I certainly recommend that you complain through this procedure!