Which television service are you using, Sir?
Keep service singular not plural. And in your question you asked "I wanna." Your writing would improve if you spelled the word out instead of putting it in slang: I want.
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Most style guides say that "sir" would not be capitalized in this instance. It would be "Which television service are you using, sir?"
(This comes from a professional editor, so trust me.)
Trust me. I have a degree in English from a Jesuit College. I am a writer and read voraciously. If I were to say, "What aisle are you looking for, Miss?" I would capitalize "Miss." You never hear of sir Paul McCartney or sir Laurence Olivier. You capitalize "Sir."
