spark energy ripping off consumers and small business's total scam- don't lose big money houston Texas

I am a small business owner.I am in retail food business and electrity cost can be subsantial part of my overhead w/ refrigeration and freezer runing 24/7. I signed a 24 month contract w/ spark energy at 8.13 cents per kilo watt hour to try and save a small amount of money running my business over my local electric provider peco. (phila electric company) .with the new contract peco sends you bill and collects the supply part of bill for electric company that you choose  in this case i choose spark energy. all is well and good until you unknowingly let you contract run out and it goes to a variable rate. that when they kill you. you dont alway pay attention to the month that the contract runs out and think if it goes off fixed.theymight raise it a little till you renew back to fixed.But thats the trap a variable rate.Spark doubled my electric rate to over 16 cents per kilo watt as soon as it hit 25 month . theynever called about signing a new contract or send letter that your rates are going to double or even increase. they want to get you off contract so they can slam you for thousand of dollars and by the time you find out it may take at least 60 days to find new supplier or switch back to peco and have meter read. you cant even withhold money and try to dispute rate incease because peco will shut off your electric . there is no excuse for electric rates to double in 1 months time and spark will not do anything . even if you were a good customer for 2 years and offer to sign another fixed contract. they know got you for big money and dont care. by the time i got out of doubled rate and with another company my small business paid an extra $4100. dollars in electrity .thats alot of money they ripped me off. and i could have used that money for my sons college tution.. stay away from spark  energy they are theives         even the public utilitly commison,and office of consumer advocate,does not regulate or stop these ripp offs- goverment agency are incompedent