Receiving invoices while I cancelled the contract

i have Cancelled my contract with telkom online , i had two phones on contract the other one was cancelled fine , but i have been struggling to cancel the other number, i requested cancellation and received a confirmation email on the 2nd of July but i keep receiving Invoices monthly but i had cancelled the contract , my case / refence number is ***5. Ive called the customer service line and went to the south gate branch for assistance but im still receiving Invoices,

i am unhappy with the service most especially because i have been a loyal customer for years, all i want is for my contract to be Cancelled ,immediately.