Try this:
"We have carefully reviewed your request to defer payment for two months while maintaining bi-weekly service. After consideration, we must respectfully decline this arrangement. Our company policy requires regular and timely payments to ensure we can continue providing the high level of service expected by all our clients.
We understand that unforeseen circumstances can arise, and we are happy to discuss alternative payment arrangements that may better suit your current situation. Please feel free to contact us if you would like to explore other options.
We value your business and hope we can continue to serve you under our standard terms."