paid up Wonga loan

I had a loan with Wonga that i was a little late in paying due to being retrenched from work. however i paid it in full. for some reason i was handed over to a firm called Blake and associates even though i contacted Wonga and told them payment would be late and the reason for it. i paid up my loan in full only 2 weeks late. since then i have been constantly harassed by these lawyers to an extant where i am considering going to my attorney to have an harassment case brought against Wonga as my account has been reset and i am still being harassed.