Didn't get the bundle deal as promised

I was convinced to enroll in Ipad+ipad mobile line together with my internet service back in Jan, 2025. I was told back then in Jan that I will get $40 discount every month applied to the internet bill after I enrolled in this bundle deal while paying for the new ipad and ipad line. HOWEVER, now it's Jun already, I am paying for full amount of both the internet service and ipad line and NOT getting the $40 discount that was promised.  I had to chat with xfinity assistant for more than 10 times to talk about issue and only got 2 months of credit back. I'm afraid next month I still won't get the monthly discount as promised and I have to call again. If I knew this would happen, I wouldn't have enrolled in xfinity and would go with my verizon account to avoid time I wasted on these fake deal conversations.

See below for the chat history:

nullnullAgent (07:40 pm): Your monthly bill for the iPad will be around $40. Since you have a $40 discount with the Internet, you do not need to pay any extra amount for the iPad. Once you activate the iPad, you will receive a $40 discount.

nullAgent (07:43 pm): The $40 discount is for the next 12 months. However, do not worry. Before the offer expires, you can come back and take advantage of the offer again.

nullAgent (07:46 pm): Yes ! You are correct. 

nullnullAgent (07:49 pm): Once you activate the iPad, your monthly bill for the Internet will be lowered by $40, and you will be charged $40 on your mobile bill only. 

HOW can this be resolved?