Incompetence service

Since November 2021 I've been eligible for upgrade, I tried getting a specific tablet and was denied. My contract expired 30 April 2022 which initially they had said 1 April 2022. Nonetheless, I called vodacom on 2 April to inform them that I will still not be upgrading but rather ending the contract and will then be on prepaid. I was informed someone was gonna call me when I did the cancelation but noone has called.

Today, I receive the monthly airtime. I called to find out why as I had canceled the contract since it has also ended but was told it's not canceled someone will call but I'll be expected to pay the monthly subscription as I received the airtime.

I do not want the airtime and while I still have another contract with the company, please take your airtime as I will not be paying for your incompetence.

Thank you