编辑同志:前不久,某酒厂要求向我粮油中心购买一百吨粮食制酒,我中心接到他们的传真后,给他们邮寄了两份没有签字的合同书。某酒厂在收到的合同书上签字后,给我中心寄回了一份,留下一份。我中心立即按照合同发货。但他们由于产品积压,又要求我中心将粮食拉回,并拒绝付款。我们拒绝拉回,并要求他们按照合同的约定支付货款和违约金。某酒厂辩解说,我们并没有在合同上签字,因此合同并没有成立。请问,他们的说法能成立吗? Edit Comrades: Not long ago, a winery asked me to buy 100 tons of grain wine from our grain and oil center. After receiving their faxes, our center mail them two copies of the contract without signature. After a certain winery signed the contract it received, I sent back one copy to the center and left one copy. My center immediately in accordance with the contract delivery. However, due to the backlog of products, they also asked my center to pull food back and refuse payment. We refused to pull back and asked them to pay the purchase price and liquidated damages as agreed in the contract. A winery has argued that we did not sign the contract, so the contract was not set up. Excuse me, can they say that?