Depending on how your billing cycle falls, you may not have compleeted the requirements for the unlocks quite yet since you have to complete and pay for one billing cycle after purchase of the iPhones.
Also, there are no unlock codes for iPhones. Once the unlock is granted their IMEI numbers are whitelisted on the Apple unlock server.
I completed one recently within about 10 minutes on xfinity Mobile Chat but made sure I had compleeted all of the requirements before initiating the chat.
I did not understand! I paid the total price of the device and they sent me an email asking for the IMEI numbers and some other information, I conclude everything they asked me and said in all the calls I made to the call center that would send me unlock codes
The problem with people telling you they will send iPhone unlock codes is that they do not know what they are talking about.
If I were you, I would log into your xfinitymobile account page, scroll down to the bottom of the page and use the Chat icon and start the process over again. Once the unlock is complete (within a few minutes on Chat for me), you should receive a confirmation email.