1. I didn't talk to Angela yesterday. This is fine.
2. I worked really hard and we got the contract. This is fine. You could say 'so' instead of 'and', but 'and' is not wrong.
3. I have seen the film Titanic years ago. With 'years ago', you are talking about a point in the past, so you need to use Simple Past tense, ie 'I saw . . . '.