so what your saying if its a civil letter we should ignor it and it will go away, and they will not come and sue us?

Look, life comes with no guarantees, my experience is that generally speaking the cost of hiring an attorney, paying for the attorney's time as well as the filing costs involved in a small claims suit typically results in no action taken if the letter is ignored. If a small claim suit gets filed than you can pay to make it go away.