No refund received

In the month of July I purchased a pair of boots and a scarf from Spree. They informed after receiving order confirmation that the boots were damaged/faulty and gave me the option to either receive a refund, credit or exchange. I rep**** to say I would like a refund and subsequently submitted my banking details. On the 18th of August I received an e-mail to confirm that I would receive my refund between 3-7 working days. After a month I have still not received my refund. I have followed up and tried contacting customer service numerous times with no one answering or being able to assist. I urgently require assistance as this is completely unacceptable. Spree is a fault here and is long overdue with my refund.