Money going off your account which can't be explai

For the past 2 months been having transactions from my account like if someone sends me 400 and it will be on negative when I go withdraw it when I go to the branch the manager can't even explain what going on and when I call customer care they tell me my account is always on negative but I fail to understand how can I withdraw and swipe my card if it always on negative....someone is busy with my money my statement is so strange to even look at it cuz most transations I don't even know about?