Extorting money with menaces

  I'm sorry to have to say that I have been the victim of a greedy but plausible criminal in the last few weeks. This menacing personage demanded my money, which he said he needed urgently to pay off his debts, pay for his medical treatment and for his cost of living, non of which had been incurred at my urging. He threatened me that if I didn't pay over 700Eur to this fund he would lock me up or take even more money.
  In fact, as you may have guessed, this extortionist is the French government. All my income arises in England, and is duly taxed at source by another demanding person but that's another story.. We do have a double-taxation agreement between our countries to ensure people only pay one lot of tax. However, the ingenious but dishonest French have decided to ignore this, and take 'Social Charges' (not tax no, perish the thought) on part of my income arising from letting our former home in Plymouth. This money, they say, will be used to pay off the National debt, repay some of the overspend on medical costs and on general social costs. I feel that the French National Debt is not my business, and my health cost is passed on to the English National Health  so this is sheer extortion akin to a hold-up. I am thinking of ways and means to avoid this daylight robbery. Has anyone any ideas?
  Bye for now,Going to sit and fume...