VAT increase on March Invoices

No increase was communicated to me that my Account will increase with R139 and when I contacted vodacom due to an sms that stated my account is in arrears, the lady said that the VAT increased and that's what's the supervisors communicated with the call center staff. She had tha audacity to ask me di I know what VAT is while I am working in accounts and we all know that the VAT only increases in May 2025.

I am not willing to pay extra without proper communication!!!