The remote will not lock/unlock the doors?? Just replaced the batterys!

What is your question?

I just had the batterys replaced last week. And if you lock the doors inside the car you can't just stick the key in the lockc to unlock them because it sets off the car alarm!! So what do i do to fix the remote! And $75 is a lot of money for something that is not gonna fix the problem! My remote opens the trunk just fine so?