Taxes may be applicable to your purchase of Bloc Ads depending on the market or region of your "contracting address," unless otherwise agreed.
If your business address is located in South Africa, your invoices will be issued by Thundersnow Pte. Ltd. Your ads purchases will be subject to a Value Added Tax (VAT) at the prevailing rate according to South Africa tax regulations. Bloc will add VAT to the cost of your ads purchase.
Refer to SARS for more details: https://www.sars.gov.za/types-of-tax/value-added-tax/
Note: Bloc is unable to advise you on tax matters. Please contact your tax advisor or your local tax authorities for any tax questions that you may have in relation to your Ad purchase.