Dear manager,
I am writing 
this
 letter with regards to bringing your attention to one of the problems I have faced with your Uber driver, who cancelled my ride due to the payment method I selected. Linking Words
This
 caused  huge trouble for me as I was about to miss my exam.
actually, I have an important exam in the north of the city at my university and so I decided to take an Uber. I waited for it in my location for 30 minutes but unfortunately, he did not come.  I called  him and he said, due to my online payment he cancelled that request. I had to cancel that trip. Linking Words
Moreover
, I had to take another taxi and I was under pressure because of his actions . 
I would appreciate it if you consider the situation and try to solve the problem of payment online. Linking Words
on the other hand
, I expect the driver to give explanations for his bad behaviour. Linking Words
in addition
, all of the charges that were deducted from my account were returned. and since that, Linking Words
this
 happened had a huge impact on my exam, I  emphasized I do not accept any excuse.
Thank you for taking the time and your consideration of my letter.I looking forward to hearing from you as soon.
Yours sincerely,
SalehiLinking Words