I have TTK for both 360 and XOne as well.
There was a discounted collection upgrade available in the XBOX store, but now it has disappeared.
Bungie says here, that the upgrade will be available till 01.31.17
https://www.destinythegame.com/upgrade
But it doesn't say anything about a discounted price...
Will the discount return, or did I just miss it? (-45% compared to "normal" preoder)
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There are a lot of problems with this, i have my own post about this problem. I haven't checked yet but the conversations i had with microsoft were really terrible. Every employe gave a fundamental different answer and kept saying to go to bungie with it, where bungie said got to microsoft. I hope it out of the store because they are fixing the problem. Just wait and bump posts about this problem on the microsoft support forum.