Amazon South Africa feels like a **** - no refunds

I purchased 6 gas cylinders from Amazon at the end of December and realised that there was a size limit for each EFT. I went on their site to return the items and was asked to contact the seller. When I contacted the seller, the seller asked me to contact Amazon and eventually I went to Courier Guy to return the gas cylinders on the 6th of January. Its now over two weeks with no communication or refund even though their page states that returns are done in 5-7 days. When I go on their website, there are no contact details under Returns and its a complete worst of time because I am taken from one page to another with no option to contact any agent. The seller is very rude and blue ticked me. I am really frustrated as I spent money to buy the gas cylinders and even to return them, its almost R10,000 that I have spent on this and Amazon South Africa feels like a big ****. There is no phone number or email address for Amazon South Africa. The only contact number I have is for the seller who should ideally be answerable to Amazon South Africa and it feels they found a loop to bluetick clients.