Settlement agreement

I was called 3 months back to be informed that my account was handed over fine made arrangements to pay my off my debt in 3months for about R3500

Now all of a sudden I'm getting calls that I have 6 months remaining for me to pay off the debt now it seem like the debt has doubled which does not make sense and before I was paying 1200 for that debt and nw made arrangements to pay more towards it

I asked for recodings since it states when you call the call centre that all calls are recorded no one is able to provide me with that instead they hug up my calls all the time

Can you please assist before I escalate this issue further with ombudsman, I'm disappointed in the way the call centre handles my matter very rude and disrespectful