Bank Can't Help Me Reverse Unauthorized debit orders!!

I've been going back and forth trying to cancel unauthorized debit orders on my account and I have been calling the call center to find a solution to this. I was advised by the call center to reverse/cancel online so I asked him to take me step by step through this, still it couldn't be done. He said there is nothing he can do for me I'll have to visit a branch. I am not able to visit a branch and do all of this as I'm currently working overseas and the best he could do was give me the numbers of those companies making the debit orders. I called and obviously nobody answered. What is the solution in this instance, my bank is supposed to be protecting my money as their client but I'm getting no way forward at all.