XFinity Comcast Bogus Fees and Charges on Cable Bill Philadelphia Nationwide

Xfinity upgraded their system and sent popup messages to my 91 year old  mother on her TV screen, that in order to continue to see HD she had to order boxes with a self install kit which would ship for free or a tech will install for a fee. She chose the tech. He arrived on a Sunday spent 45 minutes removing her 2 boxes and replacing them. On Wednesday of the same week 2 boxes arrived via UPS, which she did not order. A week later she receives a bill for 6 boxes, shipping and handling additional service fees, outlet fees, totalling $178.00 in addition to her normal bill. She almost had a stroke. I returned the unopend boxes called Comcast, very uncooperative. I explained that my Mother is 91, she cannot pay a $350 bill for their mistake. She has 2 boxes not six, she should not have to pay a $50.00 installation fee, since the Tech took as long as he did and was trained. The boxes they shipped were not ordered and the original message said if ordered they would be shipped at no cost. The agent tells me she cannot issue credit until the boxes are received even though she sees they are in transit. The 2 the Tech took with him and the 2 I returned. That was infuriating since she knows they are not in my Mother's house why should she be penalized for their upgrade and error! Could not speak to a supervisor have been dealing with this for a week, getting no where.