The tax bureaus are all under the jurisdiction of the region. You have to complain to the tax bureau where the seller is located. After verification, the tax bureau only pays a fine. Whether to issue an invoice depends on the specific situation. At present, e-commerce is relatively loose.

Online shopping must communicate with customer service in advance.

If the other party starts to agree to open a special ticket and reneges after confirming the receipt, you can go to Taobao's official customer service to complain.

No communication in advance, no questions, no complaints afterwards.

Although it is not illegal, it is not kind enough. Compared with the price of online shopping, it is basically a low-price discount after tax deduction.