Employer Cut Our Pay Due To Issues With Other Departments Pay

For context we work in a fraud department for a large bank in the UK/ contracted through an outsourced company also based in the uk. And have had several issues with pay in the past, anytime there's a raise or any change in pay, there are issues with the payroll team where we almost always get under paid for a couple weeks at least (we get paid fortnightly) and they usually tell us that pay will be resolved on our next paycheck (which isn't always the case). We all used to work in the personal banking department at our company then got up skilled to fraud about a year ago. (And obviously with that came pay issues also). We never received a flat rate increase on our hourly, but receive an "uplift/ bonus" to make up for our higher position.
So me and my team received an email from our boss today stating that because there were some employees / teams that have been receiving double that uplift pay (not our team, we are receiving the correct amount), they have cut everyone's uplift pay. Which is a significant amount. Which I believe sat just below the amount of £100. They have given us no deadline and have only said that "there will be no uplift pay on your next two paychecks". We have been left in the dark on how long it'll take to fix and if we'll even receive what is owed. This has left myself and quite a few other member of my team in a tough spot, as bills and other expenses are at risk and leaving us in a near impossible financial situation.
My.question is if this is even legal, or at least if there is anything we can do about it. We have tried asking our managers/ boss for more info, but are just met with "we are currently looking into it". Any advice would be greatly appreciated, thank you!
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