MTN Retention dpt.

My contract ended in January 2024, I called on the 2nd of February to check if its canceled, the agent pressured me to do an upgrade I told her No. I then went to the brunch in Mall of Africa to make sure its canceled but nope, to my surprise I will be billed until March. Why? This ain't fair to the loyal customers, I've never skipped a payment. Im so upset I want to cry.