Question

من چند بار مراجعه کردم نبودید کی بیام برای تحویل مدارک مناسب هستش

Answer 1

Simply, you can say:

I came to you (or your office) several/some times, but you weren't there.

When can I come to deliver the documents?

Comments

I came to see you couple of times but you were not available. Please let me knkw when would be convenient for you to hand in the documents.