Random Diamond deducted from account which I don't remember spending at all

So I have this situation where Random Diamonds are deducted from my account which I don't remember spending at all. I safe my diamonds as don't have much money to get more.

Last month randomly 11 diamomds were deducted which are not even showing in current records. Now I see randomly 9 were deducted from account on 19 Jan 25 a event whereas I have enabled secondary verification(useful in saving me some tickets spend recently) and ideally I don't remember given the authentication code at all since enabled.

If I try to reach support it keeps bringing back me to the same KB article u must have spent it. There is no way to even ask questions to mlbb or vizta games. How can I raise this query to them? Or how can I recover my lost diamond even though very less in numbers.