What happens to an upgrade if you remove it?

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Chris K. #7521
Chris K. #7521 Posts: 486 ✭✭
I only just found out about these upgrades yesterday so I apologize if this is a dumb question. I saw that I had 3 slots and I had an upgrade that gives $1 off per month so I applied it to the first slot. Then today I received a second upgrade that gives me $2 off per month, but I cannot apply it to the 2nd or 3rd slot because I realised that although I can see them, they haven't been unlocked (Bad UX). I also can't seem to apply my new upgrade to the first slot, I guess because my $1 upgrade is still pending.
I'm assuming that next month I'll be able to replace the $1 with $2 upgrade? Also if I do this, what happens to my $1 upgrade? I know they are valid for 2 years, but if I remove it can I still use it again when I unlock another slot or is it only allowed to be applied once? I can't find this information anywhere on the website and in the forums I've seen contradictory information.
Thanks!

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