Product Buyout at the end of the subscription

My first subscription with Rentoza is just not getting finalized. I took a galaxy watch 5 on the 15 August 2023 which was meant to be for 12 months. There is a buyout fee on this, so I spoke to a consultant who helped with my other two subs & asked if the buyout fee can be divided into instalments & she said she was going to mention it to her team leader but that can be done. I assumed that Dec was my last instalment to settle the watch and finally own it...to my Suprise when I enquired via support, I was told that my assumption was wrong. So again, I asked for the buyout fee to be dived into instalments so that this watch sub can be settled and am left with the new two subs only. The person who helped from support agreed that it can be divided into 3 instalments. this is now the 5th month after my twelve months has lapsed, the five instalments I have paid so far would have settled the buyout fee by now. But it seems I will be paying this particular sub for longer which is not fair at all.