Refund /office hours

Very shocking services received ..Payment was made and debit order was taken..Called in and asked when refund will take place the agent advised that when overpayment is made I need to call the call centre for the refund..3 days later no refund tried calling Wonga at 16:30 the operator says its not in the business hours called back stayed on the line for 38min with no response..Office hoirs are between 8 and 6 but one calls ag 8 and the operator says we have called outside the office houra called again at 17:00 still no answer.Absolutely Disgusting services Will not recommend these people to anyone