Mobilesplus are *****sters!!

I was contacted by mobilesplus saying they were from MTN. I was offered more airtime and a reduced payment on my current contract. They had all the information about my contract down to the amount of airtime I use. When I agreed to the change I received an SMS saying mobiles plus has accepted my order. Confused I went to MTN who said they do not deal with mobiles plus at all and my information had been ****** by them. They said mobiles plus is able to cancel my current contract and charge pro rata amounts to my bank account. How is this even possible. They checked at MTN and mobiles plus had added another SIM card to my contract which is not what was agreed on by me. Watch out for these *****sters. They lie and get you to agree to them debiting your account. This is not MTN. Do not fall for it. If you ever want to do any changes to your contract do it in-store and not over the phone!