Student loan — SLM CORPORATION (PA)

Keep getting calls about my loan. My daughter has student loans through Sallie Mae, I am a co-signer, due to her pay schedule her payment may be a few days late. We receive robo calls about a week before payment is due, and then for about a week after. These calls come every hour. I have called and talked to their representative and they tell me there is nothing they can do to stop the calls even after the payment is made.