Consumers should complain in person whenever possible, but if they cannot get to the place of purchase, it is acceptable to phone or write the complaint in a letter.

消费者应尽可能亲自去投诉，如果不能亲自到购物的现场，那么打电话或写投诉信也是可行的。

youdao

Consumers should complain in person whenever possible, but if they cannot get to the place of buying, it is acceptable to phone or write the complaint in a letter.

消费者如果可能的话，应该亲自去投诉，但是如果他们不能到购买地点，以打电话或是写信的方式投诉也是可以受理的。

youdao