What does a complaint letter full block-style look like?

A block-style letter is one that follows a certain format in which everything is justified to the left side of the page. The tone of this letter should be official in nature. Inform the other party that you will be filing a complaint. Be a clear and succinct statement regarding the nature of the complaint, and make sure to include all of the relevant information in your written statement.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

i think its c

independent