Money disappeared from my account

I have a recurring issue of funds disappearing from my account, at first i ignored it but now it getting out of hand. None of the Aspire service suite consultants can assist in fact all they say is they can only asssit me with what they can see meaning that they cannot account or comment on missing funds. They have also confirmed that there are no fees that I was charged further supporting my query that money just disappered from my account.Unfortunalty I cannot screenshot my conversations with 2 of the FNB consultants and paste it here. In my inconact messages which they referred me to i can clearly see I had R2124, i withdrew R2000 and available balance was R124. A few seconds later i log back in to my account and find that I have R4 available left. My monthly fees went off yesterday so its definitly not those!If this was a ATM charge then surely R2.70 for every R100=R54 in which case R70 should be in my account? I also dont want some lazy excuse of available vs balance story because I dont no have an overdraft facility infact i am well aware of every single transaction that goes off my account because i personally fund every single transaction i am about to make from my savings. My available funds were R2*** withdrwal=R124, R100 disappreared now i am left with R4 available.I was refered to cpmplaints department to assist regarding the missing funds