My experience with Doha Bank is different.

Few months back i used Lulu card for 50 riyals (I believe twice on the same day). So I got the money deducted twice (50+50 = 100 Riyals). I thought it is a double entry and went to the bank to launch an inquiry. Finally it was a genuine transaction. But Doha Bank deducted 25 riyals as a charge for each inquiry. So they deducted 50 riyals considering that I have made inquiry for two transactions. I called their customer service and they were not aware about such a policy and I went to the branch for the same. The guys there had to make few calls to understand there is a policy like this with the company.
My questions are simple
1) When I registered the complaint why they haven't informed me about the charges?
2) If some one got a doubt for a transaction of 20 riyals, the charge to investigate that will be 50 riyals (If proven as genuine transaction). Is it logic?
3) I gave a letter to the branch manager to take action in this matter. No reply yet (More than 6 months).