Subscription paid, received email to say subscription is cancelled, no way to communicate with them

I have been using gpslogbook for a long time. When informed of the new paid subscription service, I duly paid the new subscription on 15 March 2019. The invoice and the email containing the invoice had different reference numbers, I used the invoice reference, and notified them about this on the same day. I tried to call, but no one answers, and you are requested to send them an email, which I did, but the email went unanswered. Today I received an email stating that : "Unfortunately we have not received payment from you for your GPS Log Book subscriptions and your services have been suspended." I tried calling again, bu there is no answer. I guess this is R360 down the drain, and I have to look for a new solution.