What does 'call' mean? Is 'you' (the listener) is included in 'us'?
Some languages discriminate between 'we' not including the listener and 'we' including the listener by using distinct words. But English don't so sometimes arises confusion.
What does 'call' mean? In a context like this, it almost always means 'phone'. Is 'you' (the listener) is included in 'us'? No. When should we phone you?