It makes sense to reject a sham marriage (marriage of convenience) arranged solely for the purpose of admitting foreigners to EU on false claims of "anknytningsperson" (loosely speaking "connected person").
It is not legal to pay a person to become an "anknytningsperson" and the Swedish authorities have been very clear that it is not legal.
I've tried to report a so-called sham marriage that was approved solely for the purpose of admitting foreigners to Sweden. I spoke with the police, the immigration office and the immigration court, the tax authorities and they say that the case is not unique but that they don't have experience.
The background is that some of my acquaintances started to fabricate and sell false documents which they have registered at the tax authorities and at the immigration offices.
In one case, the lady got paid SEK 100 000 (what kind of money is that?) and the couple didn't live together but the lady registered at the foreigner's address for some time and they registered an intention of getting married with the Swedish tax authories to fake that they had a relation. Now in fact the couple was already married by convenience in Iran to begin with. They had not met before the marriage.
There are several court cases where these cases are called crimes against the law of foreigners ("brott mot utlänningslagen").
The law is clear that it is not legal, and the immigration authorities even answered that if it is a marriage of convenience then the application for immigration is not legal, so the case seems clear but still the falsification has been approved which is not legal.
Is there any advice what to do to complain?
The Swedish criminal law is available in English here.
The prosecutor agreed that one relevant jurisdiction is:
A person who gives untrue information about his identity or about other than his own affairs in a certificate or other document, or for the sake of appearances prepares a document concerning a legal document shall, if the act jeopardises proof, be sentenced for false certification to a fine or imprisonment for at most six months. If the crime is considered gross because it involves misuse of official position or for other reasons, imprisonment for at most two years shall be imposed. A person who invokes or otherwise uses a false document referred to in the first paragraph, shall, if the act jeopardises proof, be sentenced, as there provided, for using a false document.
Recent news about sham marriages is clear that it is not legal and the penalty is 3 years in prison in the UK.
There was also a BBC article about sham marriages recently.