@gulshan
To understand and know when to use them, it's important to know which tense each refers to.

Both have (plural form) been and has (singular form) been are Present Perfect Simple tense.
The present perfect simple tense is used to talk about a past time, which has very strong meaning for the present.
The present perfect simple is formed by using the auxilliary verb have/has and the -ed form of the regular verb (the past participle) or the appropriate the past participle) of irregular verbs.

Had been is Past Perfect Simple tense.
The past perfect simple tense is used to go further back in time when we are already talking about the past. It can make it clear that something had already happened at the time we are talking about.
The past perfect simple is formed by using the auxilliary verb had and the -ed form of the regular verb (the past participle) or the appropriate the past participle) of irregular verbs.

Have is a primary auxiliary verb used in the formation of a sentence in the perfect tense.
Eg. They have learnt their lesson(Present tense--plural noun)
He has finished his work intime(Present tense--singular noun)
I had never seen the Taj before(past tense

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