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There's practically no way to contact them. They have an AI bot that wasn't helpful at all, for my issue and... that's it. If AskBo doesn't work, which is very probable, you are totally alone with no help on any issue whatsoever.
I used to have a paid subscription for long years and I was happy. Then they changed my plan to a new one, that was inferior to what I had and I couldn't do my job properly any more. I ended up moving to a competitor. My free (now) plan at ahrefs doesn't even let me check a website's DA (their own metric! having me moving to competitor's metrics. Great marketing move!) All that at a time where a competitor is giving life-subscriptions for cheap.