I built a bathroom with a heated floor last year. For that floor I needed 42 m of heating cable. This cable is poured into the flooring screed and as such can not be spliced, it has to be in one piece.

Ir ordered 42 m and got a parcel with 18 m in the mail, apparently the person who processed the order mistook the order sequence number - 18 - for the ordered amount. I notified the supplier about this mistake, added some photo's of the cable - which is helpfully marked in meter-increments - and told them to send a new cable as I ordered 42 m.

The supplier sent 24 m of cable.