Bad Customer Service and overdue refund!

I purchased a flower arrangement on the 19th of November for a friend's birthday, however the online payment for debit card transactions would not process after 2 attempts, I then decided to use my credit card instead which did work. About 3 hours later a received an sms notification that the intial 2 attempts did go through on my debit card which means I had paid for the flowers 3 times. I then mailed the call centre and received feedback from Clayton that the I needed to submit a bank statement with proof of the debit amounts which I then emailed through as requested. On the 25th of November I was informed that payment would be made within 3-7 working days which would be 4 December. this did not happen. I then followed up and on the 8th Dec and received an email from Lerato, she rep**** on the 14th of Dec to apologise due to a high volume of emails my refund will be done in 3-7 working days which would be 23 December, this did not happen. The amount is over R900.00 a lot of money to wait for a technical system glitch which is not my fault!! I followed up again on Monday 4th of Jan and spoke to Lerato who personally promosied to call me back on Monday I am still waiting!!