A debt adviser reviews your income and expenditure to work out how much you can afford to pay towards your debts.
The adviser contacts your creditors, explains why you need a reduced monthly payment, and requests that they agree to it.
The adviser also asks your creditors to suspend interest (and any other charges) on your debts.
Your creditors are very likely to agree to a fair repayment plan and to suspend interest and charges on your debts. This is because consumer credit lenders are required by their regulator to treat customers in financial difficulty fairly.
This positive outcome isn’t 100% guaranteed unfortunately; you are still reliant upon the goodwill and support of each creditor.