I returned goods to Dell on March 4th and since that time it's been 16th days 

According to terms and conditions Dell should refund my money in 5-7 working days. We are talking about the 3150£ .

They send me credit invoice but credit has never happened and when I try talked with them on the phone they are saying its "technical glitch in their financial department " and they ask for my patience. I'm sick of waiting and I really need my money now. It's simply illegal . 

Anyone has similar issue in the past?

.Im about contact my bank or Citizen Advice and report money froud. 

Kind regards