How to cancel a suspended Klaviyo account?

I purchased Klaviyo basic plan in January, used it to its full extent. The results weren’t promising for me so i stopped using it but forgot to cancel. It charged in Feb, which isn’t a problem for me. Now it is trying to charge my card again in March. I had absolutely forgot about klaviyo during this period. I came to know when my card transaction was declined. So now my account is suspended, and i can’t find the option to cancel my account. This is supposed to be a prepaid service. If i am not using it in March and let me cancel it pls. Email & chat support is disabled and there is no call numbers available. So there is absolutely no way for me to approach Klaviyo team to resolve the issue. Please help. Thanks