Student or Learner
I am not sure if I have used "followed by" correctly in this sentence. Thank you.
I sent my first letter to XXX Company on June 15, 2013 followed by three more letters on July 15th, August 3rd and September 3rd. When I still did not receive any reply I then called XXX Company last Thursday. A lady explained they were short of staff therefore they had not responded to my letter.
...they were "short-staffed" is the American way to say this.
If they are unable to respond to customer correspondence in three months, they won't be in business much longer.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.