march this year i signed up in a company name? if a new owner comes in do they have to stay with opus???

opus energy, i have never come across this company but was duped and misled into signing a contract, the prices i was charged a unrealistic and the way i was disconnected to a building with my new born and parents living above the commercial premises. they have no regard after paying them 2500pounds and then being disconnected with a demand of a bond of 5000pounds or risk of not being swithed on??? surely this is criminal, they came for electricity bill which i have said cannot be correct after spending 1500pound on led lights to reduce a 50w to 2w. now they want the gas paying or will not turn my supply on????? can anyone help and how can i get out of this contract, this has nearly driven me to seriously think about suicide, to have no hot water and heating as the boiler wont run without the supply after paying 2500pounds, i only agreed to pay this if they kept me on.