2 sentences

1. 您可以拨打客服电话查询您的账户余额。

   nín kě​yǐ bō​dǎ kè​fú diàn​huà chá​xún nín de zhàng​hù yú'é.

   You can call customer service to check your account balance.

   Source: Dong Chinese Dictionary

2. 消费者向客服中心投诉了产品质量问题。

   xiāo​fèi​zhě xiàng kè​fú zhōng​xīn tóu​sù le chǎn​pǐn zhì​liàng wèn​tí.

   Consumers complained to the customer service center about product quality issues.

   Source: Dong Chinese Dictionary