If you make an agreement with a company to make payments and they revoke the agreement, what are your obligations?

Question Details: The company has agreed to accept $5 a month and sent us an agreement letter stating it was arranged. We are low income and cant afford more but they have accepted the first payment and then denied the payment every month sending it back with a letter saying it isn't acceptable. They are refusing the agreement they have set with us. What are the legal obligations on our part? I have been told once they agree to the payments and accept the first one they have to accept all of them otherwise our business is null and void and we no longer owe them because they are refusing our payments.

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