Ipurchased some items from England as they were on sale the company put a full price declaration on package I got discount 20% offI paid with exchange in to dollars$237 the company DHL Express sent me a bill for duty of 15% on $288 company in England put full value on package plus $6.50 for deferment fee I have purchased from other companys never paid duty is this normal don't you get a duty free allowance should I call customs is this correct I go to London I would of just had them sent to my sister as I know I get $8oo allowance on goods brought in person plus should I get a readout from them showing proof they paid it..