Diclined transaction nor reversed

On the 22nd of August I went to Edgars and bought make up for R510 and it declined twice. the third time it went through after using a different till. I got two sms's confirming the reversal and my balance was correct. I then went to Spar, Chicken licken n drew R300. I then got an Uber and went home... all the transactions were recorded n the balance was right. on the 24th I tried to buy airtime and R500 off my account without an sms or notification. My last balance and the balance before I bought airtime had a difference of R500 odd. I called twice and im told about pending transactions and still if take them off the balance, there is still R500 off shot... FNB you better sort this out ASAP. What kind of business are you running. #ANGRY