BAD BAD BAD SERVICE, AGENTS DON'T GIVE CORRECT INFORMATION, NOW WHO MUST PAY? ME? I CANNOT

My contract was supposed to end on the 31st May 2019. I called Vodacom sometime in April to give them notice to migrate my number to prepaid. The agent who i spoke to advised me to call them between the 1st May and 13th May I think, When i called after the 1st May i was told i needed to call exactly on the 1st May if i want my contract to end on the 31st May. Now they said the contract will end in June. Now this morning i see the allocations, I called Vodacom again, they are now saying this contract will end in June, but will pay the last bill in July, when I was told previously that the last bill will be in june.

Firstly, I called them in April, and i was given incorrect information. Vodacom must get all the recording and make sure they cancel this contract ASAP as i will not be able to pay for this till July.