Unathourised sim swap done

Im really dissappointed, Only after going thru Mtn, New Generation, and unknown company that my cell number is now on contract with Mobilesplus, that was done without any contract being sent to me or communication, I only rec a call from telesales selling me the top up offer for R30, of which I had to fight for with Mobilesplus, July 22 2015 I emailed [Email Removed] to confirm the banking details are still the same and to go ahead with the debit order but no response or action whatsoever, NOW on 06/12/2015 Mobilesplus decided to do an unauthorized sim swap on my number without any warning or communication. how is it my problem for the billing dept to fail debiting my account when the money is there and authority was given. what kind of service you call this. I need my cellphone line back in operation and update of any outstanding amount for R30's YOU FAILED to debit, eversince Ive known Mobilesplus its been a nightmare having to follow up on your promised services and your pathetic agents service. I associate your actions with *****, I will be escalating the matter higher if ignorance persist.