Lazada complaint: Refund not returned

As I bought a product in lazada on oct 2022. The product seems too be not working. I have returned the product as advised by the lazada to the ninjan van on 08 Dec 2022. Then I keep following up. Even that too hassle between the delivery person and lazada.i was struck in between after all trace up I proved the evidence by getting letter from the ninjan van and sent to them. Finally lazada agreed we have the product. Now another issue the refund part . Initially there have said the refund credited to your account . After trace back no refund was made to my account. After showing all evidence. They agreed that the refund was not made. Until nw my amount of 686sgd no idea . Even I follow up no proper response and till saying the same we are investigating and will come back. This is what I heard from the time and I was solving and giving all the evidence from my end but seems no action is taken from there end worst customer service and solution resolving. Being as a loyal customer for the past 5yrs with the lazada I feel worst on the service. I dnt whether I can get my refund or not its almost 1month and 15 days as of now 12 Jan 2023. Dnt knw how long do I hv to wait for my refund