If that's the case, why are you blaming us for this incident? We've sent a number of packages to the UK and this is the first time a tax
washas been imposed on a parcel. We have no control over what goes on in the UK(,) as we are a US company, and have no reason to know other country's tax policies. Does this make sense to you? Perhaps, we can give you a discount on the shipping.
'Have no reason to know' could be replaced with 'are not in a position to know', to make it sound better.
not a teacher