Dear [Seller's Name],

Thank you for your recent communication regarding the proposed price adjustment for our ongoing supply agreement. We understand that market conditions and production costs can fluctuate, which may impact pricing strategies. However, after careful review of the current circumstances and considering our long-term partnership, we regret to inform you that we are unable to accept the proposed increase at this time.

Our existing agreement has been mutually beneficial, and we have always strived to maintain a fair and balanced relationship with all our suppliers. The current proposal, while understandable in context, presents a challenge for us in terms of maintaining our own financial stability and meeting our clients' expectations.

We would like to request further discussions to explore potential alternatives that could address the challenges both parties face without compromising our mutual interests. Perhaps there are opportunities for optimizing processes or identifying cost-saving measures that could alleviate some of the pressures you are experiencing.

We value our business relationship and hope to find a resolution that works for both sides. Please let us know if you are open to revisiting the terms or if there are other options we might consider together.

Looking forward to your response.

Best regards,

[Your Full Name]

[Your Job Title]

[Your Company Name]

[Your Contact Information]

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This email maintains professionalism while clearly expressing the refusal to accept the price increase, suggesting a collaborative approach to problem-solving. It avoids overly technical language to keep AI detection low while remaining clear and polite.