Cancellation of contract due to no internet signal

Had an existing contract with Cell C of 2gig data, upgrade on 21/2/15 to 5Gig. Since upgrade no internet signal at my premises. After several enquires at Cell C, Mall @ Reds. A clerk informed me to cancel the contract, nothing they can do about signal. Will take up to 4 weeks to send out consultant to my house. Can't wait that long. Daughter at university and daily need the access for work and assessments. Went to Vodacom and they check on the system and there is indeed no signal in the area I'm living. I'm using Vodacom 3G for my work and I've got signal with it, so I took out a contract with Vodacom. I then phoned Cell C on 6/3/15 to cancel the contract. Need to give 30 day notice and was informed that contract will be cancelled effective date 1 April 2015, reference number ***. On 31/3/15 an amount of R829-38 was deducted from my bank and we received data. After enquiring this morning, 01/04/15 the contract was still active and they know nothing about the cancellation. I want the contract to be cancelled immediately and refunding of my money.