老客户欠几十万想赖账，不支付，求助！！！！！！！！！！！

i he a customer in uk he received 3hq but not pay all payment to us , we been work 3 years and he is local uk , its never cheat before ,we trust . this time the shipping company release goods to buyer without our alow ,so we now solve with shipping company in uk ,and they are also holder another 2 hq other goods from this customer ,for asking payment for me . but customer said he he only hq payment can send me he will pay rest 3hq in 15days , if shipping comoany not release his other goods ,he can not sale and get money pay me , what i do ?. now customer promise pay one hq to us today ,and rest money need 3 week pay all but he need we sign the release paper to shipping , and release his another 2hq goods .so he can sale and get money pay us ,otherwise he has no enough money to pay . what i do 货代是有责任，他也一直在帮助追。，但是客户没有钱，今天只能支付一个hq 的，其他的要时间。、 我如果是叫货代扣住他的其他的货，他没有法短时间筹到钱支付我，但是我不叫货代扣住的话，我怕客户不给我钱。 那怎么呢？ 他一共是了3个hq ，他答应了今天支付一个hq，。因为货不会那么快的掉。 其他的3个星期付完。 而且他要求我要release 3个hq 跟货代。我不答应的话，他就不支付，继续拖着的话，对我们不利。 货代那边也是天天催。但是客户没有钱，催也没有用，只能是等待？？？