It appears that many expatriates are not aware that they may be entitled to legal aid in Spain. It is quite easy to obtain this free service if you meet the criteria. You basically need to be a resident and on a low income. Pensioners who have the tarjeta 65 (sixty five card in Andalusia or the equivalent in other regions) are entitled to free legal assistance. (Abogado de oficio)
To inquire about entitlement, visit an office of the ‘colegio de abogados’ which are to be found in most mayor towns If you do not find one in your area there, visit your local courthouse and they will advise you where to go.
College of Lawyers
I am afraid I have to add this footnote. These lawyers are normal lawyers who also offer these service. You will unfortunately only get what is paid for. If possible, pay for a lawyer.