如您收到货物发现卖家发错货了，建议您保留好相关凭证，优先旺旺联系卖家协商换货或退款处理。如未能协商一致，建议您按照以下操作处理：
1、如订单未“确认收货”，建议您关注交易超时，及时【申请退款】，选择“退货退款”。
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2、订单“交易成功”的0—15天内，建议您优先【申请售后】，选择 “退货退款”。
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注意事项：“交易成功”的15天后，页面上申请售后的入口已经关闭，如商品存在问题，建议提供有效凭证，联系淘宝网客服处理。
3、以上申请如卖家拒绝后，您可以申请淘宝客服介入处理。
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根据你的情况，货物已经签收，可以先不用确认收货，等待卖家补货。如果卖家一直没有给你补发货，建议你申请退货处理。
申请售后的具体流程如下：
1、若交易成功您未收到货、收到的商品不满意等需要申请售后，可以在交易成功15天内登录到【我的淘宝】—【已买到的宝贝】，找到对应的订单，点击【申请售后】：
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2、请选择您要申请的服务类型：我要退款、我要退货
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3、以【我要退货】为例：申请服务类型选择【我要退货】后，按照页面提示完整填写相关内容，其中*号为必填项，填写完后点击【提交申请】即可。
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参考资料：/consumerservice.taobao.com/self-help#page=issue-detail&knowledgeId=6685863"target="_blank"title="淘宝网-卖家发错货，怎么办？">淘宝网-卖家发错货，怎么办？