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Caroline emailed MoneySavingExpert.com sharing her success story, saying: "I would never have thought to even look at the social tariffs... you have saved me over £300."
The findings raise fears that vulnerable older people may become even more isolated - or miss out on information about financial help.
The Fibre 2 Essentials bundle is available with speeds of up to 73Mbps for £20 a month - the standard version costs £25 a month, meaning those who can get the social tariff will save £60 a year
The single mum was able to cut her broadband bills in half by switching to a social tariff, a means of support which is hugely underclaimed.
Around nine million Britons - around one in seven - could be overpaying by sticking with their current phone provider.