No way to communicate with Vodacom to provided proof of payment

We have been trying for the past two months to communicate with Vodacom and provide proof of payments for both April and May account having been paid already without success. Due to where we live our cell phone reception is very bad and we can't phone the call centre. Their Payment Bot calls don't give alternatives to only adding a date to pay by, their online services do not allow uploading of proof of payments. Their WhatsApp chat bot also doesn't have the correct options to choose to send a proof of payment. The email addresses we do have and which are provided in their email communication to us do not work and bomb out after a couple of days. Now we are being threatened with disconnection and disabling of the devices on this account. Yet we are fully paid up on all accounts. We have been using this EFT method and account paid into for almost a year and now all of a sudden there is an issue!! Account is fully paid up according to our records!!