terrible experience with online support

When opening an internet account back in 2024, I was offered a free iPad with mobile service, and I was told it was free, no extra charge at all. I confirmed with the sales many times and got the same answer. 
But I kept charging for 29.7x monthly for the iPad with internet service. 

I called support many times, and every time I had to repeat the story again and again.
Two agents went through the entire chat history I had with the sales, and said I would be refunded , and no charges in the future, but it did not happen. It has been several months, and I I still have not gotten it resolved. 

I called them again today, and the first representative told me he doesn't have the access to do that, and I asked to escalate to the next level, he put me back to the phone line, after a long wait, I was transferred from mobile team to sales, the sales guy said he can see the refund was denied, and said they is nothing he can do, and escalation cannot help, I insist to escalate the next level, and he said he will transfer me to the next level, and then put me back to the line again, after 15 minutes wait, i was connect to the mobile team again, and it's the normal support level, not the higher level. 

That's terrible. They cannot resolve my issue and don't want to transfer my case to the next level.

I have called Xfinity since last year, and each time, I have been promised a refund and no more charges. but it was just not happening.

I cancelled the moble service, but will have to pay the devices fee for another 13 months, and cannot return it because it's over 1 year. 
I paid over 400 dollars + another 13 months devices fee for an A16 iPad, which I did not use it at all. I took it at the very beginning, as I was told it's totally free, including internet service. the price I paid is much higher than the market service now. 

I was told several times that it was Xfinity's fault (since the salesperson who opened the internet accountt for me said the promotion is for internet but actually it was for the mobile phone line) and Xfinity would take responsibility, but now they told me they can nothing on it, and I had to pay the price for their fault.

No more Xfinity. terrible experience