Eskom or Tshwane reaping off customers with power readings during load-shadding

My complain is related to the electricity usage during down-time/loadshadding. This could be a @Eskom matter. I have been suspecting that each time we under go loadshadding, my prepaid units drop drastically each time power comes back. This evening at 19:57, i did the reading on my prepaid monitor and recorded 40.95kw, and immediately at 22H00 when power was restored, the prepaid monitor reading is now 30.88 kw. the question therefore is what happened to the 10.07 kw as I had no power then?