Never take a loan with them

I took a loan in December. Paid the first installment then the second one was late. They handed me over to Blake & Associates which gave me a 50% discount. Which I settled 30th of April. They told me it would take 10 working days to show payment and that I can only get a paid up letter from Wonga. The whole month of May it kept saying I owe Wonga. After no feedback from Wonga (emails, phone calls - which is apparently only automated. And going to Facebook messenger) I still have not received a paid up letter. Blake & Associates just puts me on hold for 6+ minutes. Today I received an sms stating that my Wonga loan has been sold to another debt collecting agency but they can't give me any info as it isn't showing on there side yet. A month and a half later. Still no paid up letter and no feedback from Wonga. Yet they keep selling my information.