Was I Mistaken?/Did I make a Mistake?

Several weeks ago before, (before what! to use before you need a specified time, like 'today') I have consulted an English school in by telephone for about my English . The school asked for me to visit it. saying they will would provide me a trial lesson, so i got went there in this morning.
A beautiful girl with wearing a black dress talked spoke with me; she was very gentle and polite and asked me about my English studies.  Then she gave me a test me in on computer. After the testing she led me into her office, and told me about my lesson schedule/timetable. All of this took me maybe/perhaps two hours spent  me maby town houses (wah! you are spelling as you have heard it but your hearing is inaccurate) but i have been was waiting for the trial lesson. At last she tell told me that they provide a trial lesson only when I apply to join this school

They cheated you, they lied. 他们是骗子，要欺骗你。

Made a misstaken  mistake 

Several weeks ago, I have consulted an English school on telephone for my english .The school asked for me to visit it. They would provide me a trial lesson so i got there in the morning.

A beautiful girl with a black dress talked to me. She was very gentle. She asked me about my english level. Then text me in computer (不是很确定这里你想表达什么). After texting she led me into her office. She then told me about my lesson's schedule.All of this spent me maby town houses but i have been waitting the trial lesson (不是很确定这里你想表达什么， 所以没有修改) . At last she told me that they only provide a trial lesson after i apply to this school. 

Comment: 

Remember to capitalize "I"  

Remember to capitalize first letter in English because English is a proper noun.  

End with a period after each thought. 每个想法等于一个完整的句子。 这个在中文母语的学生中是比较常见的。 

Please, Let me try ;)

Make a mistake

Several weeks before, I have consulted in some english school about my english study by phone. The school asked me to visit it. They promised me to provide a trial lesson, so I got there in the morning.

A beautiful girl with a black dress talked with me, she was a very gentle. She asked me about my english knowledge . She was also adding a new account to the computer. And then she told me about my lesson's schedule. I have been waitting for the trial lesson . At last she told me that before I get a trial lesson, I have to apply this school.

Make a misstake.

Savaral weeks before, i have consulted an English school on the telephone for my English .The school asked for me to visit it. They would provide me a trial lesson so i got there this morning.
A beauteful girl with a black dress talked with me ,she was very gentle and asked me about my English studying .Then texted me on computer.After texting she lead me into her officer that told me about my lesson's schedule.(I Couldn't understand this sentence  ((All of this spent me maybe town houses))) but i have been waiting for the trial lesson .At last she told me that they provide a trial lesson when i apply to this school.