I want my money back

On the first of December 2025, I ordered a Hisense smart Tv online[***],the following day I was informed that the item was out of stock and that they have processed my refund which will take 3-5 days to reflect on my account.When the 5th day passed with no refund, I proactively sent a follow-up inquiry email. I was then told that I was supposed to have received an email requesting my banking details (an email which I never received). This is a clear failure in their internal communication and process. Now, after their initial delay and error, I am being informed that the refund will take a further 7-14 days to be processed. This is completely unacceptable!!!