The credit bureau dont keep documents. Your original creditor does. The changing of an account number doesn't mean much. The debt is there.
They have probably handed it over.
I would be interested to know how much it is... because that influences the level of effort the debt collector will go to to collect.

Around 300k. I dont think the collectors are just gonna let that amount go.
As I have said the OP has some cheek thinking its ok to do what he is doing just because "bank bad"
I get that sht happens, but no payment arrange made on your end, no I can pay R50 for the next 3 years. Just if I lie low it will go away... cause BANK BAD and mean.
Then annoyed that bank sold debt and how dare the collector ask for money thats not theirs...
I am not a trust fund kid etc, I have been through hard times I have seen my parents go through hard times and take responsibility for their debts during these time and make arrangements to pay what they could....