Spokeswoman Jill Wurm says about 10% of their customers had problems switching to a FairPoint e-mail account when the company took over phone and internet service from Verizon at the beginning of February.
FairPoint has been bombarded with calls since then, more than 13,000 calls in a three day-period.
Wurm says the company has increased the number of people handling those calls and working the online help desk.
A 24-hour technical support website and hotline have been launched to help customers.
The website is www.myfairpoint.net
You can also call 1-800-240-5019