OK, so I see what your issue is.
You have signed up to a discounted variable rate and you are entitled to that for the life of the mortgage.
If you choose to switch to another product, you are not entitled to switch back to the discounted variable, unless your contract says so.
Most of the tracker guys had no such legal entitlement either, but the Central Bank made them give them trackers as the paperwork was not clear enough.
In particular those on trackers who fixed were not told that they would be giving up their trackers. You have been told clearly that if you fix, you will lose your discounted rate. So you have a choice - fix and followed by normal rate or stay on Discounted Variable.
You could check your contracts to see if they were so badly worded that you have a right to go back to a discounted variable rate.
Brendan