Help with VIP & etc

i need help figuring out how am i suppose to get 8 rewards that all cost 4k each and i want to receive my children of the vault weapon that the 1 2 3 step guide said it would give me can anyone please help me with this?

check your in game mailbox under social

Press start, go to social tab, then go to the last tab on the right to redeem/read mail.