Verb conjugation of "undeceive" in English

I have contacted you 12 months ago to propose your school's inclusion in our language school directory. I wanted to inform you that our site achieved high positions in search engines last month.
I remember once again how I failed as a student, mainly in French class. Since I have lived in Russia, it was not easy to learn other foreign languages. The alphabet is also different.
Thank you for your kind message. I have not done anything for my Spanish because I have too much work at my job. I might write you a letter, but I'm so busy at work that I can't afford other hobbies.