Double monthly home loan payment

I've previously had this problem whereby money from my home loan access facility goes missing. One time, it took 3 weeks of going through various levels of the hierarchy before a regional manager had someone verify that my money indeed went missing, and paid it back. Not before I felt like I had to harass the bank to pay attention and follow up.The next time my home loan account was double paid - from my bank account and from my access facility (which I use to deposit extra money in). Both times, I wasn't provided an adequate explanation as to the cause of this serious systems glitch. This month, again, two amounts are paid toward my home loan. I.e. Standard bank get use of my money which I can ordinarily access whenever I want. This is an opportunity cost to me, and a waste of time pursuing this same issue which seems to be a regular way to misappropriating clients' funds.