We have also raised this concern to our Accounts Team along with your billing cycle refresh query.
As per checking, we have offered you a 300GB of Data for $79.99/month and you have mentioned to upgrade the plan as soon as the payment is posted.
As advised, the change of plan will take 3-5 working days and there will be changes on the billing cycle as well as the debit date once the upgrade has been processed.
Our Accounts Team will contact you tomorrow for further assistance.
Should you have further queries, feel free to drop us a message.
We can see that one of our Account Specialists has been in touch with you and provided assistance with your account queries
Please let me know should you require further assistance.