Lack of Service

Double Billed. Incorrect Invoices. The service is despicable. No one can explain my invoice and the double charges. I cancelled my 4G as I wasn't receiving service which a credit was passed but the invoice shows that I am still being billed for it. On top of it, have the audacity to send an sms "To avoid limited internet access due to non-payment...". How do you expect me to pay for something I am not using? I am only linked to 5G. There is no accounts/billing department who can assist directly, everything must go through the call centre who do not understand the query. The service doesn't even deserve a 1 star. Rain should be out of business.