Horrible customer and refund service

I ordered and paid for a patio set online on the 21st April 2023. The following day I received an sms from 1 of the employees that the set is not available, so I gave an option of cancelling the order which they did and they mentioned that I will get a refund within 5 to 7 working days. Its almost 4weeks no communication or responses when I try to follow up. I regret buying from leroy merlin online, they are taking forever to pay the refund plus no one is communicating with me about this matter.