I took out Vox contract back in 2020/2021 i think

I took out Vox contract back in 2020/2021 i think. This year 2025 January/February I whatsapped and emailed them to kindly put my account on hold/cancel it as i was going away for few months I will resume up on my return. Then stopped paying from month April I think was paying under R650. Between then and now I've been getting emails, calls and sms's saying I owe Vox latest statement say I owe R3354.33 which they are handing over for How can I be owing for services i requested to be canceled or put on hold on time, Why why must I pay for what I didn't use and to show it is crazy the amount doesn't even correspond between then and now Why does Vox want to destroy our names and credit for fun