It is always worth a try, you might want to enclose a 'Income and Expenditure' I spreadsheet/table which shows them you income-wages, any benifits etc, and then your expenses listed down, such as rent, utitlies, council tax, food, clothing, car/travel, tv lic, sky, parking, everything you can think of.
Make sure it shows very little if any left over income after expenses, possibly even negative income.
If that does not work and you feel the debt is getting out of control, if family cannot help, seek help from a 'Licensed' Insolvency Practitioner, who can advise you, you can find there number in the yellow pages, or talk to Citizens Advice, there are other free debt help lines too in the yellow pages you could ring for advise.
Do not ring the companies on the tv they do not have you best interests in mind.