Vodacom misleading and *****s, think its time for a change!

I received a call in December advising me that they will reduce my subscription the consultant goes on explaining, I ask him four times if my number will change, he advises now, I am happy to accept thinking my data contract will be reduced. January 2020 I pay my account bear in mind I am a customer for 18yrs already, February 2020 swings around and I reduced not the reduced bill my an addition invoice and number, I immediately contact them and advise them of this they come back to me to offer a 3month discount on this new number. I refused and expressed that they should cancel the contract. this month I get a new bill with a reduced subscription after being told the contract is cancelled and if I do not pay it will affect my credit score. I think Vodacom is ripping people off and misleading.