Vodacom contract cancelled/deleted

I took out a contract at the beginning on 2019. I failed to pay installments. My network suddenly went down. Could not take or receive calls. It said my number did not exist. I subsequently called Vodacom I was told that they communicated to me. I’ve never received a call, an email and a letter never reached me. So it’s unfair that happened.

They said I was at the legal department and have 12 months to pay off. I made an arrangement. Now my number is deleted. Basically can’t use my phone which is not right. The original number belonged to me as a prepaid which I switched to contract and did a sim swap. Vodacom has no right to delete my number. Also I’m unable to use the phone. I feel I should be entitled to use the device as prepaid until I pay off the balance. The agents are not helpful over the phone. What should I do.