Upgrade policy

<p>Good day, Im due for earlier upgrade received the sms and everything, only.to find out that I cannot upgrade from an data line to an voice line? Since when as all other networks allow that, even if I end up paying more for my upgrade but still NO UPGRADE!! Was told telephonically and instore, but when you sign a new line you are not being told that you cannot do that as with all other networks u can upgrade to data from voice and vice versa even to a contract paying less no problem at all and when u ask why u cannot do that the answer you gethave is take up a new lineline or wait till term ends and thenthe open a new voice line.</p>