Appling service and Billing

I had the shock of my life when i receive a text saying i will pay more than what i was paying hen i had the contract which has since expired.

What has been worse not being able to get hold of customer services , the number redirects me to a whatsapp option which only shows information i already have an know.

The billing team never calls back when i seek a call back , however a debit order is due to be taken on the 1st.