Urgent Billing Issue - false/hidden fees, horrible customer support

I signed up for Xfinity internet about 3 weeks ago, and was sold a promotion where I was told I'd receive a free phone line through Xfinity Mobile.

I was sure to ask if there were any other fees associated with this phone line, and was assured that there would only be a one-time, $10 line setup fee.

I was also told that for opening the line, I would also receive a $150 Visa gift card.

3 weeks later, I have not received any communication about the $150 gift card, and there is an unexplained charge of $39.19 on my billing console (this is in addition to the $10 line setup fee, which I knew about).

I spent over an hour on live chat with 4 different Xfinity customer service agents, who kept transferring me to other agents and failing to resolve my issue. Finally, I was told to call a customer service line at 888-936-4968. When I initially called, they were closed. I called the next day, and waited on hold for a while. When I finally got on the phone with a human, I was told that their "system was down" so they can't help me at the moment, then the agent hung up.

At this point I am extremely frustrated with Xfinity because (1) I was hit with a $39.19 charge that Xfinity told me would be $0, (2) it has been near impossible to solve the issue with customer support, and (3) the SIM card I was initially sent was defective, so I had to order a new one, and had to go without a working phone for over a week.

I need the following:

• A credit of the $39.19 bill
• Clarification that the phone line will cost $0 per month moving forward, otherwise I'd like to close the line
• The $150 Visa gift card that I was promised.

If this is not resolved by the end of this week, I will cancel my $70/month internet service and switch to another provider.