Harassment by RL Daly Attorneys' call center

I have a Mr Price Mobile account - or actually had one. I actually contacted Mr Price via mail to find out if there is any insurance for loss of income on this, but the account was handed over to RL Daly Attorneys, so Mr Price chose to ignore my request. Now, this call center's employees of RL Daly Attorneys do not seem to make a note on their system. I have sent various emails, with the relevant documentation to show them I do not have an income, but as and when I get some funds, I do honor this account. But low and behold, they will constantly send mails or call me. I have now - thanks to new technology - blocked most of their numbers, but they are persistent and will keep on phoning, that after I have informed them that if I do not have funds, Mr Price can wait, seeing that they chose to ignore my request, as the funds I have will rather go towards food in my house than an outstanding amount of pittance. It seems they are illiterate, because they cannot put my request on their system, but will rather call so that whoever collect the arrear amount could earn their commission.