Replying to both your questions: if the correct amount for your bills wasn't included, you need to contact your counsellor ASAP to get that fixed. But you need to be aware that there is a maximum monthly amount allowable for the expenses that are included in Basic Living Allowance, as follows:
Food per person: $200
A hardship request is an application to receive additional money on the basis that you can't afford the costs you're facing. It needs to be a very strong application: you'd have to show your bills and make clear that you can't afford to stay in school without help. Generally, you'd be expected to have applied for other sources of help and to have taken every possible step to reduce your hydro (eg do you avoid using appliances during the most expensive period? Have you tried to find a part-time job to help with the expenses?)
Contact your counsellor first thing tomorrow and explain that you need this help. Ask whether she has ever submitted a financial hardship request - if she hasn't, has another counsellor at the same agency?
Regarding the amounts entered on your application, is it possible that the correct amounts were reduced to fit within the maximum allowed? If the wrong amounts were entered and this wasn't the reason, you could ask your Ministry contact whether anything could be done, though I doubt that you could get any change backdated, because you would have signed your application form for Second Career, which means you are stating that the information in the application is accurate.
Good luck. I hope you can get some help.