Oil spilt on floor causing me to slip and fall

On 21 Jan 2016 I went into U Save / Shoprite in Munsieville. There was only one till open and there was a large amount of oil that had been spilt right in front of the till. There were no warnings or cordoned off areas to stop customers from walking directly into the oil. I went up to the till and slipped in the oil and fell. My clothes, bag and other items were covered in oil and I sustained injuries in the fall. The manager came up to me and apologised, I was able to get up. The next day I had a great deal of pain and went to seek medical assistance. I also contacted the regional manager Liz and she said she would look into the matter. Despite meeting with her and leaving messages Shoprite have done nothing about my fall caused by their negligence and are ignoring me.