paynet systems they failed to provide service yet billed me alpharetta , Internet

To whom it may concern:
I contracted with paynet systems for a credit card terminal and services.  I was approved and requested a terminal to process charges. I received an e-mail from them requesting I fill it out and approve the charges for the terminal.  I responded by e-mail that I was unable to open the e-mail they sent me.  I waited a week or so and there was no response.  I called customer srvice and it was a very unpleasant conversation and i was hung up on. I contracted with another company and thopught all was well until I realized that they were taking funds from my account. when I called them they said I would have to pay a $75 fe for early termination.  I was flabbergasted as they had not provided any services.  I went to my bank and rejected the charges. they wwould only reject the last 2 charges so I was stuck with the ones they already received.  after many calls they finally closed the account.  Now they have turned this into a collection agency that is ruining my credit. I do not feel as I owe them anything as they failed to provide services and  were very unhelpful in customer service.  I will forward several e-mails that they never answred including the one I could not open.
I would appreciate any help in this matter.
Sincerely,
 
Karen
georgtown Kentucky