CONTRACT CANCELLATION MISHANDLED

Good day,i have been in touch with MTN customer department regarding my contracts since they were ending on 26/9/2021 so as i knew that i have cancel in advance 30 days so , i emailed to mtn on 17/08/2021 to cancel any further contract upgrades and migrate my both numbers to prepaid. and i also mentioned that once contracts are expired i am not liable for any charges since i am requesting of cancellation on expires of contracts, but my request was mishandled and now mtn wants me to pay 1500 out of contract charges. i can not pay this money, i have all proof regarding cancellation.

*EMAIL FROM MTN ON 17/08/2021 2.49PM ENQUIRY REFERENCE NUMBER ***

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* EMAIL BY ME

Good day,i would like to cancel further upgrade on regarding numbers *** and ***.please cancel both upgrade as soon as it expires. this is a humble request. i am not liable for any further charges.

THANKS SUHEL PATEL ***

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CUSTOMER NAME : SUHEL M I PATEL CONTRACT NUMBERS : ***/ ***

Please assist regarding above or else i have look help from Consumer Department.