do not want an upgrade to my contract

I have been receiving calls regarding upgrading my contract - i have advised the agent that i do not wish to upgrade this contract. they told me to call in - i have called in for 2 weeks now and evey time i am number 1 iin the queue, the call ends as there is no space in the mail box.. currently today, i have called 6 times each time the call is ended before i can get through to anyone i have been on hold for about 2 hours in total now i called the upgrade department and the lady was very rude about why i would like to not upgrade and once again told me to call ********** and use option 1.... how do i sort this out if no one can answer the phone?