You have two choices: Could you please let me know whom I should contact? Could you please let me know who I should contact? The first is the traditionally correct answer, given the understanding that "whom" is an object pronoun corresponding to the subject pronoun "who." The second, at this point, is far more common, at least in spoken US English.
So now I'm out $6+ for a game that is installed on my Xbox that I can't even start and MS won't give me a refund, let alone help me. What's more if I am even given a refund Cions of Vega is currently selling at a discounted price and if I'm given a refund after the sale ends I will not repurchase it at full price after this hassle.
A partner proposed an ideas and I would like to confirm by email that it's acceptable for us. I've written the following: "We accept your proposal. Please let us know if there is anything to do from our side."
Let me ask you a question, will you? is certainly a possible way of posing a question, but I don't think the will you? is a question tag in the traditional sense.
Could you please let me know when payment is made? (Tell me when you've paid me; for example, by directly depositing the money to my bank account and sending me a scan/photo of the deposit slip.)
Dear group, Could you please let me know which expression is grammatically correct and polite? I am trying to write to my mentor that I need her approval for a form. Can I say "Please let me know if you approve the form? I will submit it once approved". Or should I use .."I will submit it once...