Money just disappeared and no help or answers from FNB Forex!!!!

I had a friend in the UK send me R6,300 from the Uk to my FNB account via Xoom - I received an email and a text message 2 days ago and the money has disappeared? FNB have no records of it - nobody can help me! Xoom only uses robots - there is no actual person you can speak to about the query. FNB are useless too!!! I have spent hours and hours atthe bank and on the phone to them