MTN SUCKING ME DRY FOR A CONTRACT THAT HAS ENDED 15 JUNE 2020

my contract with MTN eneded on the 15 June i have send numerous emails and also called their call center reference no;292 893 156 but my contract was not cancelled. MTN is still giving me air times and debit orders on my account please help me to resolve this. Aa i write this email i am on hold for 30 minutes they are giving me a run around.