Altering transaction logs is pretty stunning, even for a Playtech casino. They must have realised they'd made a huge mistake and then desperately tried to sweep it under the carpet - somehow I think they might fail
As for the comp points - it's an interesting issue. They can't claim software error as all that's happened is a member of their staff put in the wrong conversion rate. You can't retroactively decide to pay out the "correct" number of comp points as that'd be like letting someone play
BJ all evening with it paying out at 3:2 for a
BJ. They finish off in profit and then you tell them actually you meant to pay out 6:5, so it turns out you owe us money instead.
I think a reputable on-line casino would just have to accept that they'd made a stupid error and take the losses, but it's going to be one hell of a fight to persuade an outfit like this of that. I suppose it depends whether they value their reputation or not.
Comp points can be debated but two certainties are: 1) altering transaction logs is unacceptable and has to be put right & 2) anyone who won without taking comp points into account must be paid those winnings.