Vodacom refuses to upgrade my contract, 26 years customer.

I have been a vodacom client for 26 years and have had my same number since then. I have never missed a debit order. In Covid i lost my business and had to go into debt review, now 4 years later i am nearly done with debt review, ut i am not able to get a new phone on contract when upgrading. My vodacom contract was not part of the review but still vodacom refuses to upgrade my contract with new phone. WHAT CAN I DO. Will MTN assist then i can migrate all my contacts over to them.