Items lost during the delivery process

I bought compression tights from Nike Online Shop on the 29th of January. paid an extra R250 and the delivery was scheduled to happen within five days. five days later i receive an email informing me that my items had been delivered which came as as a shock to me since i hadn't received any items. i contacted them to make them aware of the error and the opened a case for me and informed me that i would receive feedback within 5 days. 5 days later there is no feedback so i contact them again to ask them whats happening with my case. their reply every time is that, their operations department is still working on it. 4 weeks later their operations department is still trying to figure out what happened with my order. i have asked for them to help me escalate this matter, but they are unable to help me. I am disgusted by Nike service. i have bought several items from Adidas online, Superbalist and other online stores and their delivery process is always very swift, 3 days later you are guaranteed to getting your items , and the best part is that delivery is absolutely free. and yet Nike makes you pay the R250 delivery fee to a delivery process that is flawed. shame on them!!