#Debit Card intl Pos Unsu

I am disappointed by what I have been experiencing with my account. Last month I had similar issues, but couldn't trace the cause. My account is on -120 rands now due to a R8 charge referenced #Debit intl Pos Unsu, that has charged me this amount 20 times. So they have charged me a total of R160 for something I don't even know. Just terrible from FNB