I want to know what are the mistakes in this...

السلام عليكم ورحمة  الله،  
وشكرا لانضمامك الينا وثقتكم بنا.

عزيزي العميل, اليك كتابة الجملة بطريقة صحيحة وه يتحتوي على الكثير من الأخطاء الاملائية وعلامات الترقيم.

Last week, I was at party and met people that I was have seen for the first time. I spoke with some of them. First, I introduced myself by told them that I am Heba-tu-Allah Gamal, I am 21 years old. I currently study at Egypt University for science and technology, faculty of IT “Information technology Then, I asked them to introduce themselves. They told me about themselves and I knew the department of each one of them .one of them worked as salesman at mall of Egypt, he is responsible for selling products and service for a famous company. He said that he was very happy and satisfied with his job and his salary .The second one said that he worked as IT like me, but he is 31 years old and graduated from ITI then, he worked as web developer at Oxigal Company, in addition to his freelancer work. That man was very useful for me because we have the same department, so I saved his phone number and I planned to call him to know and benefit more.

شكراً لتعاملك معنا.
يمكنك الاستفسار في أي وقت وسنقوم بالرد عليك في أسرع وقت ممكن.
كما يمكنك استخدام جلسات المتابعة معي على الهاتف. إذا كنت ترغب في الحصول على جلسة الهاتف، سيكلفك رسوم بسيطة للمكالمة، اضغط على هذا الرابط لحجز جلسة الهاتف:
jawabkom.com/25385976