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I am sorry to hear about this situation. They should not have corrected it without your authorization, and you would have put your initials by the correction.
However, provided that they did not change any actual verbiage, this does not impact the contract overall. It is still binding unto both parties, even if the name was misspelled in the original. This is because a person is bound by a contract they sign even if their name is ***** ***** they use a fake name, or an alias.
Provided that there was a "meeting of the minds" for the contract, it is still binding.
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