Complaint!!!

I recently lost my phone only to struggle with doing a sim swap because my number is now registered under this company and vodacom can not help me because this company owes them a lot of money...I am so angry with Vodacom because they allow this company to have access to our numbers and yet do very little to help us...why are the service providers allowing this company to register our numbers....I want answers from both Vodacom and this RMCS and I want my number back and back on prepaid please