Vodacom sucks - legal action pending

I called the call centre in July to cancel a cell contract which was coming to an end at the end of July - I was instructed to do this by a vodashop. There are call recordings to back this up. I got an sms confirming it had been logged but that I must wait for confirmation which I never got. In August I received another invoice so I repeated the same process again. There are call recordings to back this up. I got an sms confirming it had been logged but that I must wait for confirmation which I never got. So in October I repeated the same process again but this time with the accounts department as opposed to the cancellations department. I was once again assured that everything had been attended to, that a credit was being processed and at this time I got an email confirming this. Now 2 weeks later, my fibre was suspended due to amount outstanding on my cell contract, my credit score has been negatively impacted and the stress this has caused due to me not being able to work due to no fibre has been ridiculous. I had to pay the amount outstanding - WHICH WAS NOT OWING BY ME AS I HAD CANCELLED THE LINE - and I am now considering legal action. Such a pity as Vodacom staff have been amazing - but the admin nightmare is untenable....