Supersonic bad/no service

I pay for uncapped FLTE service. Lately I am receiving only 2-3 Mbps. I called the service centre, had to hold on for almost 30 minutes. The lady eventually opened a case no CRM:*** and sent me an email. She said send the results of a speed test. When I rep**** to the email, I received an email back to say it is an unattended email and I must call the number again. I then got another email address on their website, Supersonic Support Team <***> and sent the mail there. I once again got a mail back to say this mailbox is also unattended. I think don't use this company, obviously they have no client service.