letter of complain

I am writting in connection with a course in English for intermediate students which I have been attending. I would like to make a complaint about certain problems which have occured recently. In fact, I have already talked to the manager about this issue, but unfortunatelly I didn't notice any changes.
Let me remind you that there are two main problems with this course. First of all, the teacher sometimes doesn't appear* during on lessons. It has happened several times. She even didn't send us any information about her absence. Secondly, I am not satisfied with the a coursebook which we were studying during the course. There are a lot of mistakes and it didn't fulfill students' expectations. Personally I think it is very greatly important to practise^ in a good book in order to be ready for an/the exam.
Taking into consideration all inconvieniences, I hope that you will be able to find another teacher for on Monday classes and solve this manage problem with the a book. Please let me know when it is possible to come to your office to talk about details.
With regards

*In English, we would say "show up".

^In the US, we spell it as "practice". Because you are living in the UK, this is the correct spelling.

letter of complain

I am writting in connection with a course in English for intermediate students which I have been attending. I would like to make a complaint about certain problems which have accured recently. In fact, I have already talked to the menager about this issue but unfortunatelly I didn't notice any changes.
Let me remind you that there are two main problems with this course. First of all, the teacher sometimes doesn't appear to the lessons. It has happend several times. She even didn't even send any information about her absence. Secondly I am not satisfied with the coursebook which we were using during the course. There are a lot of mistakes and it didn't fulfill students expectations. Personally I think it is greatly important to practise with a good book in order to be ready for an/the exam.
Taking into consideration all inconvienience I hope you will be able to find another teacher for monday classes and solve the problem with the book. Please let me know when it is possible to come to your office to talk about details.
With regards