In need of reversal

Someone transferred money from Capitec to FNB but I did a mistake when giving them my account number which led to the money being transferred to a wrong fnb account..When I reported the matter to FnB I was told I need to go to Capitec when I visited the Capitec Branch I was told to go to fnb since the money is already with them this happened on the 5th May up until today I haven’t been assisted because there’s nothing Capitec can do 🚮🚮🚮What a wow a whole 40k down the drain