Hathway — Cheating customer with providing no service but getting money in advance

My last month billing cycle ended on Jun-30-2020.But your helpdesk team keep calling and asking to pay for the bill in advance which you normally do.To your kind note, I have changed my data plan and expecting the new plan would become start after the existing plan get ended(Means after june30th as per your mail).Since your team insisted I have paid an advance amount on June 27th 2020 for the new plan. But my period cycle validity becomes 27th June to 27th July.

So, My question is why you changed instantly without my existing plan ended and to use those i have paid in advance.if i would know this before then i would have paid after my existing plan ended. You can refer to my payment details with your application using the account number.

Typically my billing cycle should have started from July1st instead of June 27th. Please answer and i won't pay between July 27th and July31st as per my record.