My son ported to Virgin from MTN - It was a pay as you go deal and within a couple of weeks he wandered off to Vodacom and took out a contract on a new number. I think it had more to do with fees for internet access than anything else, but it was clearly easier to go for a new number and leave a divert message on the old one than try to port again.

Mweb is kinda interesting. I had to close an old partnership account with the final FICA push and had to move quite a few debit orders. This was done with a standard letter to all the companies that were running debit orders on the account. Mweb (and Chubb) didn't act on the message.

Chubb ended up calling me some months later enquiring if there was a problem and everything is all sorted now, but Mweb went a different route. A few months later I got a letter from a collection agency. I asked for a statement and an account to pay into and whilst they were about it, to terminate the "contract." I have yet to receive the statement, details of where to pay whatever is owing, or confirmation that my termination has been carried out 6 or more weeks later.

In my case it's an old Netactive account, and I've got a sneaking suspicion that the fine print after the initial period is one of those "as long as I pay and Netactive receive" deals, which means that cessation of payment terminated the contract anyway.

I await further developments on that front.