A company gave me an email offering me an internship. It's in another country, however, so I asked for the confirmation letter (as I need to apply for visa) on Monday. It's now Thursday and I still don't have it nor a response. I already emailed them but I haven't heard back.
I don't plan to start until late Sept 2015 though and I still don't know how long the visa process will take. How can I get the company to hurry up and send me the confirmation letter? Obviously I need to chase them up in some way, but I'm unsure on the etiquette of how to go about this.
What would be the most acceptable way for me to approach the company?