3 sentences

1. 他因为欠债，已经被几个债主找上门了。

   tā yīn​wèi qiàn​zhài, yǐ​jīng bèi jǐ gè zhài​zhǔ zhǎo​shàng​mén le.

   Because of his debts, several creditors have come looking for him at his door.

   Source: Dong Chinese Dictionary

2. 一听到敲门声，他就提心吊胆，生怕是债主找上门来。

   yī tīng​dào qiāo​mén​shēng, tā jiù tí​xīn​diào​dǎn, shēng​pà shì zhài​zhǔ zhǎo​shàng​mén lái.

   As soon as he heard the knock on the door, he was on edge, fearing it was a debt collector.

   Source: Dong Chinese Dictionary

3. 如果你买的东西坏了，可以直接找上门要求商家修理。

   rú​guǒ nǐ mǎi de dōng​xi huài le, kě​yǐ zhí​jiē zhǎo​shàng​mén yāo​qiú shāng​jiā xiū​lǐ.

   If something you bought breaks, you can go directly to the merchant and ask them to repair it.

   Source: Dong Chinese Dictionary