Phone was blacklisted without my concent

I took out a contract in September 2014 with a Samsung S5 Mini. 205min, 250sms'e and 250data. Then in December for my son's birthday I took out another contract of a Samsung S3 Mini with 50min, 50sms's and 50 data. I am paying R585 per month for both and it is way to much. Then on the 3rd of February 2015 one off my friends took my phone with her by accident. She promised to bring it back in an hours time. On my phone is very confidential details regarding our bank accounts and pin numbers. So I was scared that the info could be read.So I phoned customer care and explained the whole situation as above to them and if they could just BLOCK MY sim card and if I phone them back in an hours time would they be able to UNBLOCK the sim card and phone again and they said YES IT WOULD BE NO PROBLEM. So when I phoned back in about 2 hours they told me sorry your phone and sim card is BLACKLISTED and that I must report it to the police station. I was devastated because they confirmed that it would give me no problems to unblock it later. BUT CLEARLY in the recorded playback the Supervisor listened to in Johannesburg he said they would fix the problem.<br> my phone could only work on the 4 April??