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Are the following sentences correct?

1: Should you have any problem, please feel free to ask me.

2: Had he not help you, you could never have succeeded.
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Had he not helped you, you could never have succeeded.
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It is not a question; ergo, no question mark.
Students: We have free audio pronunciation exercises.
Comments  
Thank you, Tanit.
Do we need to put question mark at the end of this sentence?

Should you have any problem, please feel free to ask me (. or ?)
Try out our live chat room.

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 Mister Micawber's reply was promoted to an answer.
I found one site explaining this. Check this out! Should you have any problems