ParcelHero

I booked a collection on the parcel hero website entering the correct sizes and weight of the shipment, paid the £30 which I thought very reasonable. 10 days after receiving the shipment parcel hero are asking me for an extra £108.85 as they say my shipment was bigger than I stated. I have sent them proof of the dimensions using pictures with a tape measure but they won't accept the proof as it is not packed up in the same cardboard as it was on the day. The reason I did not keep the cardboard as it was left on my patio in the rain and was soaking wet.