declined foreign T 457896* 853 3 on my account (-r8. 50 being deducted from my account, out of knowhere)

For Months now I've been gettin declined foreign T 457896* 853 3 on my account nd -R8.50 is being deducted on my account every month.... FNB what is going on.... I hope you swiftly handle this matter because I really don't know whats going on... Now my accounts funds are piling up to negative nd negative... Please handle this matter