Vodacom is not reliable anymore

I have a contract with Vodacom, I made a payment of R 530 by the 31st of March 2025 however; it is not allocated in the statement of May.

I do not understand why the statement shows that I am owing while i made payment and I have sent proof of payment twice to ***

I received this response "The recipient's mailbox is full and can't accept messages now. Please try resending your message later, or contact the recipient directly" There is no Vodacom network coverage where ia ma staying, I am unable to make a call.