the company is telling me that the contract is expired but the addendum says that it doesn't expire till 3/1/2016 they wont honor contract
I sense there are important facts missing from your post. Yes those who sign contracts are bound by its terms, absent unusual circumstances you have not alleged such as fraud, mutual mistake, duress, legal incompetence, contracts of adhesion (which wouldn't apply in this circumstance anyway), federal and state rights of rescission and similar. There must be a reason the hauling company wants to change it other than just to better their economic position.
What is their reasoning?
AVVO is a general forum for discussion purposes only. My answers, comments, ideas, approvals and endorsements do not constitute legal advice, opinions or even suggestions, as I do not have enough facts and you are not my client. As well, my response is with respect to only the laws of the State of Texas. Hire an attorney in your location if you want assistance upon which you may rely.
Your post does not contain a question. But your rights and responsibilities (and those of the waste removal company) are determined by the terms of your agreement. If you have read it and believe that the waste removal company is not complying with the agreement and that they non-compliance is material enough to justify a consultation with a lawyer, take your agreement and subsequent correspondence to a local contract dispute lawyer for review and advice.
Answers in this general Q&A forum are for discussion purposes only, are not being provided in the context of an attorney-client relationship and are not to be construed as providing legal advice. Massey Law Firm PLLC and its attorneys may be retained only on the basis of a written contract, signed by the attorney and the potential client, together with the payment of fees and costs as may be required by the contract.
Consult with a local attorney--it may be worth it, depending upon the amount of money at issue, to pay for an hour or two so you can have the contract reviewed. Good luck.
Answer given for general advice and is not a legal opinion, which would require an analysis of the facts and circumstances as well as the applicable law and regulations.
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