VODACOM DOES NOT WANT TO CANCEL

my Vodacom cell phone number just for wi-fi is ***. I have phoned *** 4 times since December 2023 requesting this contract which expired in August 2023 to be cancelled completely. instead of paying R 233 per month, Vodacom then proceeded to invoice me for R285. I am a 70 year old widow having lost my husband 18 months ago in a car accident. I have to count every cent in my budget. it is very disheartening to have to call Vodacom from my MTN phone every month to beg them to cancel the contract. I even received an email with no names or reference numbers on 8th February assuring me that it has been done. Yet, the router is still live and I am still receiving invoices. Could some one just cancel the contract and get it over with please. I never receive a reference number and the names of the persons I talk to I cannot spell or understand.