Wedding Venue Payment??

The venue should be billing you soon if it's their duty and letting you know the payment is due. You are doing everything in your power to make sure your end is covered of the balance payment. They may be busy and not paying attention to what needs being done for the final bills or checking their emails regularly. Check your bank accounts to make sure the payment hasn't gone through if they didn't get in touch with you before proceeding without acknowledgement.

I would definitely call your venue and your coordinator. They might be super busy and not been able to file your paperwork for the final bill. I know that this was the case with us and our venue. It took them 6 days to have our final bill finalized

I would contact your credit card company and explain the situation, put a stop payment on the credit card as you only authorized the down payment, if you have emails showing that she mentioned paying at the venue for the second portion send that to them.

I would wait for her to reach out to you and then discuss how disappointed you are with the service and then discuss the remainder of the invoice.

We put a down payment cash with our vendor and I have to pay the final invoice 1 week before the wedding. All my vendors have been cash payment deposits.