Bad service

I had 2 contracts with vodacom, data line and a laptop. My new complex that I have moved to doesn't have vodacom signal. my phone is always off because of bad signal. I was expecting vodacom to assist, which they could not. I therefore told them I am going to cancel my contract, the data line only. Yesterday i woke up to my contracts being cancelled and charged R2300 which I assume it was a cancellation fee. No one told me about this cancellation fee and how much would it be. can you reverse this debit order