It is wrong. kWh is the number of kW multiplied by the length of time you consumed them for. Eg. if you draw 0.5kW for 2h, that will amount to 1kWh. You were consuming 0.5kW the first hour, 0.5kW the second hour, yet it was never "0.5kW/h", the total energy consumed was 1kWh.
At first your calculations look correct. But my friend's power bill, in the US, shows $0.10/kWh, yet he pays $0.17/kWh. This is because in another part of the bill, distribution charges are added ($0.06/kWh), and taxes ($0.01/kWh). My point is, reading all the fine print is hard. I don't know what your bill look like, so I am suggesting something simpler:
- how much did you pay for the last billing period (in VEF)?
- how much did you consume for the last billing period in kWh?
Surely your bill must show these 2 numbers, right? Divide the first number by the second one.
This is scarily low, and might explain your rate.
Kind of off-topic, but I am genuinely surprised and confused by this black market rate... I assume the local population favor the dollar over the bolívar, right? Why would they spend 8.6 VEF to get 1 USD on the black market, when they could just bring 4.3 VEF to a bank following the official rate?
Edit: Apparently dollars are rationed by CADIVI, so the population turns to the black market to obtain them. Makes sense...