A total of 42,840 complaints were related to express services, accounting for 95.5 percent of the total amount, according to a statement by the State Post Bureau.
The number of effective complaints stood at 1,637 last month, down 68.1 percent from one year earlier.
Thanks to the law-based handling of the complaints, consumers regained economic losses worth 5.04 million yuan (about 732,000 U.S. dollars).
In June, effective complaints about express service focused on delivery service, package loss and delay, said the statement.
China's courier firms delivered 5.3 billion pieces of parcels last month, up 25.3 percent year on year.
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