Explanations

WHAT DO YOU WANT WITH ME?= What do you want of/from me?

HAUNTED= /hɔ:ntɪd/ past participle of HAUNT. If a ghost (spirit) haunts a house, it is always inside the house and you can see it or feel it sometimes (we call it "a haunted house"). If a ghost haunts you, it visits you (especially if it's frequently).

I'D RATHER NOT= I prefer not to. The phrase I'D RATHER + infinitive without to means I PREFER + infinitive with to.
I'd rather stay here = I prefer to stay here.

GHOST=  /gəʊst/ Spirit.

THE GHOST OF CHRISTMAS PAST= The spirit representing the Christmases from the past.

HAUNT ME NO LONGER= A very formal and old fashioned way to say: stop haunting me, don't haunt me any more.

WHAT IF...= We use this to introduce a hypothesis, a theoretical possibility. It is followed by a past tense to indicate that the condition they introduce is unreal. That tense is called "unreal past" (or past subjunctive) and doesn't talk about the past, but about the present (an hypothetical present):
- What if you found her at the party = What would happen if you find her at the party.
- What if she came here? = What would happen if I she comes here?.
We can also use this construction to make suggestions, especially when we think it's a wild idea, unusual or not easily acceptable:
- What if we painted all the rooms red? (What do you think about this crazy idea?)

YOU WERE GIVEN= In English, the passive voice can be constructed in two different ways:
1- If we have a direct object, that object becomes the subject of the passive sentence.
- Peter painted the door (active) = The door was painted by Peter (passive)
2- If we have a direct and an indirect object, either of them can be the subject of the passive sentence.
- He gave Susan a present (active voice) [we're talking about him]
= A present was given to Susan (direct object becomes subject) [we're talking about the present]
= Susan was given a present (indirect object becomes subject) [we're talking about Susan]

CHANCE= Opportunity

LIKE YOU'VE NEVER SEEN IT BEFORE= Better than ever.

BAH, HUMBUG!=  Nonsense, rubbish. This exclamation is mostly associated to Scrooge and this story. Scrooge's catchphrase, "Bah, humbug!" is often used to express disgust with many of the modern Christmas traditions.