Please get my number back to prepaid

From my understanding contract is meant to be signed by both parts and I've never signed any documents or agree to any contract and this is frastrating cos I've called like 5 times to ask for my number to be returned to prepaid until I had to lose my phone with the sim and I've waited for a whole week for a call but still nothing, I mean I really don't understand this rmcs thing, service is poor, u have to spend your airtime and time to get help yet after you don't get any. I'm so disappointed. My number is ***