Missing Modem/Router and Unhelpful Customer Service

Hello! My initial order plan, which supposedly includes the delivery of the Xfinity Gateway modem/router, was erroneously delivered to the wrong address; I'm not sure if this was an issue on Xfinity's end or on FedEx's end, but either way I did not get any package. Upon reaching out to customer service for assistance, I was told another would be sent, but received no news on this 'new delivery' for several days, not even an initial email. After several more days of silence I reached out to them again a couple of days ago, and this time I got a new order form+email confirmation, but I was promised I'd get it by tomorrow the 22nd and it still hasn't said that it has shipped. I was hoping I could get a delivery ETA for it? It's been over a week since my initial order, and I really needed to have a stable internet earlier in the week to do my university homework. Currently I'm having to travel to the library to use their internet, which is not ideal for me considering I have to walk in 100+ degree weather to get there. If anyone could help me with this I'd greatly appreciate it! I understand that mess-ups happen, but the lack of communication has been really frustrating and I just want to have internet at home. At this point I've talked to several customer service representatives, and while all of them were friendly and seemingly helpful, it's ridiculous that I still haven't gotten my new shipment by now after all this effort. Thank you for your time, I'm looking forward to a response from your team ASAP regarding this issue.