I'll never take out another cell c contract again

I recently took out a contract with Cell C, for a laptop, printer, pocket router with 5GB day and 5GB night. I find that the data on the router flies as soon as you connect to it. I do not connect the laptop to the router and simply only use it on my cellphone. I've disabled the automatic update on wifi and nothing has changed. Cell c continues to chow through the data without getting the full use of the data, I would be on fb and linkedin for less than 5 minutes at a time and see how the data balance diminishes. I have bought the same amount of data on my phone through mtn and I can do so much more. I cannot wait to finish this contract and cancel my subscription.