The meaning is the same in both 1. and 2. wouldn't is stronger than didn't. If your father didn't let you borrow the car, you asked him once, and he replied 'no'.

Would not Vs do not?

Wouldn't (or would not) is the conditional form of won't (or will not). Don't (or do not) is the negative form of do. We wouldn't say "I'm having my friend".

When to use did not and has not?

Use it when you echo a question that asked "Did..." Did you see Grimm last night? No, I didn't. Use "have not" when you are talking about something that started in the past and continues to the present.