They shouldn't have asked and you shouldn't be worried about saying "no". Depending on where you live if there is any commercial organisation like a cafe or shop close by they could log into their wi-fi and use that. They should know how. If you aren't happy just saying "no" you could use the old lady "I don't do technology" excuse or a cop out I always like to use "My DS (DD) has advised me not to"
You swap personalities with your pet , what's your new personality?


. I just meant that for no cost to you you could do them a favour, and it would put you on good terms from the start.