I have had mighty miner unlocked for a long time but does not provide it as an option to have it

The fact that I do not have a single mighty miner is highly improbable with the amount of times I have tried to unlock it and when am getting a new champion card it shows the randomiser with all the champions I could get apart from mighty miner, I genuinely convinced that it is broken, please fix this. Ive literally played this game so long to not have mighty miner its so stupid.