Change Email for Primary Manager

I need to change the Email for my Primary Manager account as the one I have on there is about to expire. I have contacted the techincal department twice and have been told that the next level IT team will contact me within 24 hrs. I have contacted them twice and it has now been 48hrs with no one contacting me back. I need this changed, I would do it myself but it is not allowing me too. Any help with this matter would be great.

Thanks