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I have challenged it. I rang them yesterday, mentioned the contract, and asked what they meant by 'charging interest' and how much interest they were going to charge.
They said they needed to find out how much they were allowed to charge. I asked who was going to 'allow' them but they said they needed to discuss it amongst themselves. And so it went, on and on. Running a business, recouping money, can't provide services etc. etc.
How can I stop them making up the rules as they go along? What sort of solicitor do I need? Contract, family, probate? I have no idea.