Welcome to the community @Bundy,
Based on your post you have records of the emails you sent. I recommend you contact your card issuer or paypal as appropriate to dispute the transaction. As evidence of your position take screen shots of all the ‘guarantees’ and your attempts to contact them.
Is ‘Volta’ the voltacharger.com company claiming to be located on the Gold Coast with only a PO Box address and no phone number?
As a business the web pages are impressive but lack many of the basics for trust such as an ABN, street address and phone number unless I missed them; and there are many caveats that make their company ‘guarantees’ all but meaningless - calling in formal communications using the Australian Consumer Law could get you a better response than having been played (some companies unfortunately do this) until they believe their obligation to honour the ACL or your rights for a bank chargeback have expired. If you are unfamiliar with card disputes (chargebacks) this other topic may be helpful.
Contact your card issuer immediately, and read your rights under Australian Consumer Law. You can find many links to the ACCC as well as Choice advice using the community search.
Please let us know how you go.
