Back to the OP. Exactly the same happened to me last August after purchasing Rokker jeans from Louise-Moto in Germany. A letter arrived from Parcel Force saying they'd got my parcel and would deliver once I'd paid the Import Duty and VAT and handling fee totalling £112 ! My first reaction was "dribble, fukk um, send them back. Fortunately a friend advised to calm down and do the following.
So, I paid the £112 and the parcel was delivered. I then contacted Parcel Force and asked for a receipt. This was then forwarded to Louise-Moto who immediately reimbursed my £112 . They did provide a very short, non accusatory explanation along the lines of '"you British fekkin idiots".