Not impressed with Norman and Bisset

I had N&B collecting money from me. I got a call on Oct 2018 and they lady advised me that I owed R900 odd on the account. She said that I however have received a 75% discount on my account and the amount payable is R248 odd. I told her that I will make the payment on 31 Oct 2018. She said that if I make that payment then I owe nothing else on the account. She said she would sms and email me all the details so I can make a payment at my nearest Shoprite/checkers. I never got that sms or email. I tried calling last week a few times but never got through. Someone called me yesterday (5 Nov 2018) and said I had R800 odd outstanding and I told them about my previous conversation on Oct 2018 and how I was waiting for the info so I could make payment. She said the the offer I was given was only for 2 days and she is not sure why the previous lady gave me til 31 Oct to make the payment. She said that now I need to make the full payment that is due. I refuse to make the full payment when I was offered the discount. Please can someone get back to me so I can make my final payment to Norman Bisset of R249.