Payment made no paid up letter in site

So, my ABSA Cheque account was handed over for collection to MacRobert Attorneys. MacRobert advised that if I agree to pay in 2 installments, I will qualify for 35% discount. I have made the payments as agreed and since then I have not received my paid-up letter. I am beginning to think this is a **** - do not fall for it. Since various emails and telephone calls they keep on promising me my paid-up letter - it has been 2 weeks and nothing. ABSA Is also quiet.