I got the same message recently for an entirely different product. I just let it go because for me the situation was such that missing out was ok. I think some sellers have these blocks in place on loss leaders to entice buyers to the product, then to their shop where you can by as many as you like at the higher price.
For your difficulty in communication, perhaps you could type in English and include a translation from Google Translate. For example, you could say something like
***
Hello. I would like to make a bulk purchase of 10 HDMI cables. Could you please tell me how much this will cost. If we agree will you make a special listing for me? thank you.
您好。我想作一个批量购买10 HDMI电缆。你能告诉我多少，这将花费。如果我们同意你会做专门的房源给我吗？谢谢。
Nín hǎo. Wǒ xiǎng zuò yīgè pīliàng gòumǎi 10 HDMI diànlǎn. Nǐ néng gàosù wǒ duōshǎo, zhè jiāng huāfèi. Rúguǒ wǒmen tóngyì nǐ huì zuò zhuānmén de fáng yuán gěi wǒ ma? Xièxiè.
***
That was using Chinese (Simplified) from Google Translate.
The other option is to be patient, and every 10 days buy one item. Frustrating and infuriating for the impatient, but still an option. Good luck!
