Hello again Hanka!
I have made some TINY changes that werent to do do with tense, but only for clarity, not for style. Great work so far. I hope you make those bastards pay!
"...faults on various parts..." << do you mean various people or various items? My edit assumes various people (parties).
could you please check the tenses in the following text:
After our return on the same day, I initiated a complaint procedure during which several faults by various parties were discovered. The complaint was further dealt with by Mrs. XX from the complaints department of company YY in London. After several months, I received a statement that company ZZ had announced the cancelled flight on November 28, 2005, which means that it had fulfilled its obligation. Mrs. XX further stated that all problems were attributable to the dealer, company AAA. According to her, its office had been closed due to public holiday. Therefore I referred the whole matter to my legal representative with a view to claim compensation from the above-mentioned company. But when I addressed to Mr. BBB from the company AAA, I obtained his written statement. Amongst others things, he strictly denies that the office of the company was closed. He even states that he had been present at the counter at the airport and that the information on the cancelled flight had not been published in the system at the time.
Student or Learner