Impossible to return an item to Leroy Merlin

I bought an item online from Leroy Merlin on 4 July 2022. I received the item about 2.5 weeks later due to shipping issues. Leroy Merlin assisted to sort it out, so kudos to them. But, in the meantime, I had to make another plan as the item was supposed to be a gift, so I do not want the item I purchased from Leroy Merlin anymore. I returned the item to their Boksburg store only to be told it is a marketplace order and I cannot return it in store, they will arrange the supplier of the item to contact me to collect the item. A week passed and nothing. I phoned their contact center and a friendly agent escalated to the query to N (not going to use full names). I followed up 4 times with N and nothing. About 10 days passed I phoned their contact center again and another agent told me I can return the item in store or they can collect it for a fee which I need to pay first.... I said OK, I will pay the courier fee as it is way cheaper that petrol. This agent also said she escalated to N to send me the payment instructions. Its been 4 days since that phone call and I have not heard anything from anyone. Leroy Merlin's return policy clearly states that you have 6 months to return an item provided it is new, sealed, and in box (which it is). Please assist.