Welcome to the community!
If your services were suspended due to non-payment, you will likely need to contact their Credit Operations team to have them remove the suspension and make a payment arrangement. It should be mentioned that a payment arrangement may not be available in some situations.
If you wish to discuss the matter you would need to contact customer service. In addition, they can also be contacted via Live Chat, Facebook, or Twitter. Those methods can be accessed via the contact page posted above. Though you would still likely need to contact the Credit Operations team to remove the suspension.
Hope this helps 😀