Equipment not working well can not pay the final payment.
Based on the terms of the contract, if there is a quality problem, then the final payment will not be made. In turn, if the customer does not pay the final payment, the supplier can make the equipment stop using. Equipment debugging and installation, do not pay the final payment, you first give him another debugging at home, and then it is best to debug the process of recording to save the evidence, and then debugging to find them to ask for money.
Pay attention to the final payment:
Encountering the "cash on delivery" courier, first open the box inspection, if not their own buy items, directly refuse to sign. Usually after picking up the goods, remember to erase their personal information from the package to avoid personal information leakage. Unlawful elements will be from illegal channels to obtain customer information, fake courier sheets, and so on, and then posing as a courier to contact consumers in advance, the fake goods to the hands of consumers, said the "cash on delivery" in order to cheat the money.