EHarmony Customer Service Help/Care Telephone Number
EHarmony Customer Service Toll-Free Number
There are actually 2 toll-free numbers I was able to find around the internet, and after trying them, they seem to lead to the same system.
The phone number to call is the same whether it is a billing issue, technical issue, question about their service, etc.
E-Harmony telephone numbers for customer assistance:
Both say that they offer 24/7 support, and they offer the ability to leave a message and have them get back to you later, rather than sit on hold all day.
There is another number, 1-(626)-795-4814, which is for their headquarters in California, but leaving a message there will probably be ignored unless it is left for a specific person.