Vodacom upgraded contract without my consent

My cellphone contract with Vodacom ended on the 13th of June 2024 and I received a call for an upgrade and said I want to continue on a month to month basis. I just received an sms two days ago which says I have been upgraded and my new contract now ends in 2026. How is this even possible? I contacted vodacom to ask and the call operator escalated my query. I also sent an email to both customer care and cancellations and received a referrence. But what concerns me the most is that this process lacks integrity and the promised customer care. Maybe is time to change the provider.