HELP, Need my money back from SMARTBUYGLASSES!

Where to actually begin, my experience with Smart Buy glasses has been HELL and I won't recommend that anyone pay over money to them. One month later and I am still waiting for my money. I ordered a pair of Costa Sunglasses on the 17/02. I paid via EFT and never received a confirmation email that they received my payment. I then emailed them and asked if they received it, they couldn't find the payment at first because they wanted a Order nr, I explained to them I never received a order nr in the first place. After a few days they found my payment. Then I got a mail that my Costa Sunglasses were out of stock and they could offer me other sunglasses. I said no and I wanted a refund. They said they will process this within the next 24 hours and that the bank will take 3-5 days. This was on 26/02. I waited until 8 March and did not receive my refund. Contacted them and then they said they did refund it and I should ask my bank. I asked my bank and they said it's not refunded. Then all of the sudden they said the refund didn't go through and I should send my full bank details - ALREADY DID THAT ON 26/02 - but I sent it again. They said the refund went through on 12/03 and sent me some kind of proof. I called my bank today on16/03 and they said this refund does not exist. I am fed up with fighting and being patient. I want my money back!

If anyone has advice on what to do next, please contact me.