Terrible customer support

On 12/23 I called customer service to set up a new customer account for mobile and Internet. I was told by the agent that my new phone would be overnighted, and I was signed up for the promotion. However, I received a notification that my phone would not be shipped until the Internet was active.On today 12/24 I called the customer service line to speak with someone to see what the discrepancy was because I am without a phone and would not have signed up if it was going to take 3-7 days after internet activation.I was then bounced around between mobile department and Internet department for about one hour and 30 minutes and told the agent did not sign me up for the promotion. I stayed on a conference call between mobile and internet while they debated who could help. I then requested a supervisor in mobile. the agent MJ, who had been referencing the supervisor throughout the call said “he was busy and would call me back tomorrow “. After plainly asking if they are refusing to allow me speak to a supervisor Chris (Renz) got on the phone and proceeded to put me on hold and then disconnect the call. I called back and was told the department was closed. I spent 2 hours total with the customer support and I have ZERO resolution. I am astonished such a large company has not established an effective Customer support team. If internet is required to have mobile service how can these two departments work completely independently of each other while also having