Bangle 2 - Claiming the additional VAT in Germany

In the UK it's £76.80 (basically the same as your 90 EUR as it's got the UK's 20% VAT applied), plus the postage which is

but I paid the double price with tax and vat and postage

Really? You're in the EU? I just checked what the shop says to send to Germany and:

DHL Europe (duty paid) (Weight: 0.11kg) - 66.60€
International Tracked & Signed (Weight: 0.11kg) - 17.78€
International Tracked (Weight: 0.11kg) - 17.78€

So maybe you chose the DHL express option? Did you have to pay DHL any customs duties as well? Those should have already been paid - if you did maybe email contact@espruino.com and we'll try and reimburse you.