T-Mobile S!mpa Hrvatski Telekom d.o.o. Mislead and overcharged Zagreb

I visited Zagreb, Croatia fall 2019 and needed a SIM card for my cellphone.  I was there for 9 days.  Hrvatski Telecom (T-Mobile) had on their website 7 days of unlimited internet for 85 kuna (11 €).  I agreed to that and also paid 15 kuna for minutes of talking.  I also said that I needed more time and asked if I could pay now for the extra days.

 The gentleman said to wait after 7 days and then recharge for the extra day which was 10 kunas.  It even says that on their website.  The seven days were up and I returned to the same store.  This time it was a female and told her what I wanted.  An extra day for 10 kunas.  She told me this offer does not exist.  She said she can add three days for 30 kunas.  I reluctantly agreed and paid the 30 kunas believing that I will get three more days.  

Well, one day passed and my internet was gone.  I don't remember if I could make a phone call either.  Conclusion, she knowingly lied to me and charged me three times the amount for the extra day I wanted.  Probably took advantage of me because my Croatian was poor and also I was a tourist.  Stay away from that store and even T-Mobile S!mpa.  Try A1.