Hey @KimE, welcome to the forum.
It could be a couple of things.
1) Depending on your payment method, it can take upwards of 48 hours for it to clear on our end. This is usually the case for payments made via BPAY. You can always report your payment via the My Optus application. That's via the billing tab.
2) Have you recently received an email or SMS from us stating that your account number/BPAY Reference code has changed?
If you've paid the old account, the funds will be transferred to the new account within 2-3 business days.
As far as the consolidation is concerned, best to jump onto Live Chat.
Personal → Mobile → General & Billing. They should be able to action this request for you.