Please advise/ help

Hi... please someone referred me to Hellopeter. i have a serious problem with MTN. on 13th December i have an iPhone 8 256gb... it took them 2months and week or 2 to deliver because i was calling everyday for my prize. yet they delivered the iPhone 8 64gb.. its a wrong phone i haven't active the phone since. please what do i do? my mail is *** anyone with please i want my prize