Yes, you did. I have held children's season tickets since the AmEx opened, the Ts & Cs stated that you could upgrade, and the club let you do so.
None of this is in any way relevant.
And why is it not relevant that other clubs dont allow it. Is it because its information.that doesnt suit your argument. I think its very relevant when.having a go at the club to point out that even with the clampdown the allowed upgrades remains generous and far more than the club need to offer