My close friend from uni has been playing bf4 since like forever on ps3-ps4 , same as me, he then bought it on pc and when he got bored he decided to cheat to give himself a boost... anyways he got banned 2 times and then quit....half a year later a bought his pc, re-bought bf4 in a brand new account, i played a bit and then got banned with the reason ''Linked Account''. Fair enough right?? No. When i tried to make a ticket for ban appeal they instantly rejected it and said like ''nice try tho.'' or something like that and also that everything checks in and denied the appeal in a matter of seconds. What should i do next? How can i prove my innocence? 

It's exactly that. Nice try. We can clearly see the accounts all belong to you.

Please keep in mind that continuing to argue your appeal/ban can and will result in your forum permissions being revoked.