Madonna has been accused of "bullying state officials" and demanding special treatment during her latest trip to Malawi.

The singer, who has two adopted children from the African country, jetted to Malawi on Easter Sunday (31Mar13) and spent time meeting orphans as well as checking up on educational projects she has helped fund.

But the visit ended on a bad note as Madonna prepared to fly home - the Material Girl was reportedly infuriated after she was made to stand with other passengers, before being frisked by security.

Now the star has been chastised in a strongly worded letter from Malawi President Joyce Banda's office, issued on Wednesday (10Apr13).

The statement reads, "Granted, Madonna is a famed international musician. But that does not impose an injunction of obligation on any government under whose territory Madonna finds herself, including Malawi, to give her state treatment. Such treatment, even if she deserved it, is discretionary not obligatory."

The pop superstar is labelled "a musician who desperately thinks she must generate recognition by bullying state officials instead of playing decent music on the stage", while the authorities also suggest Madonna "wants Malawi to be forever chained to the obligation of gratitude".

The letter concludes, "Kindness, as far as its ordinary meaning is concerned, is free and anonymous. If it can't be free and silent, it is not kindness; it is something else. Blackmail is the closest (thing) it becomes."