A TPI can obtain contract rates on your behalf if you have provided them permission with a valid Letter of Authority. Corona work with selected number of TPI’s that are signed up to Ofgem’s ADR (Alternative Dispute Resolution scheme). A TPI will charge a fee for their services and they will discuss this with you.
More information on Ofgem’s Alternative Dispute Resolution scheme.
Advice on switching business energy supplier from OFGEM.
Switching your business to a new energy tariff or supplier | Ofgem
Free, independent, confidential and impartial advice when switching your small business to a new energy supplier.
Switching your small business to a new energy supplier – Citizens Advice