Frustrated and irritated Vodacom client

I have been I client at Vodacom for years now. I have phoned on the 29th of May 2020 to cancel my contract. I have phoned 3-4 times again and it's still not canceled.

I received an invoice to pay on 1st of August 2020, but I will not pay it as I have phoned and canceled my contract in time...

They are getting worse with their customer service and I will not recommend them for family and friends if you have to struggle like this to get a contract canceled.

I am just so frustrated and irritated with Vodacom. I have to keep on phoning them to sort this out they Don't make effort to phone me back with any feedback...