PLEASE END THE CONTRACT ON 04/09/2021

My data contract is due to expire on 04/09/2021. I contacted the customer care number to inform them that I dont wish to upgrade to a new package. The call center agent informed to contact the 135 number for cancellation/retentions. I redialed the number and chose the option for cancellations, but the was no one to answer my call. I held on the call for almost an hour, but there was no one to pick my call. A few minutes later, I decided to send the email to customer care. I received a quick reply. In the email, I was informed that an agent will call me within 48 hours and today is the 120 hours since I waited for call back from MTN. I cant afford to pay for the subscription for September 2021. I always receive the data on 12th of every month and pay it back on the 15th of every month. Last year they delayed to cancel my subscription on the due date after so many calls and emails send to end the contract. This time around I will not allow this to happen because, it seems like they cancel the contract whenever it suits them. I am not going to pay for the data to be received on the 12/09/2021. The reference number for the email is *** and is for the mobile number ***.