Vodacom - Bad signal strenght

I have tried since April 2020 to get Vodacom to test the signal strength at my mother's address in the Eastern Cape. I have logged numerous(7)calls but within a week the call is closed with the comments, "problem resolved and spoken to user". I am a Vodacom customer for nearly 20 years and I think this is really bad service. My mother is a pensioner and I am paying her cellphone contract, but currently this contract of her is of no use. I would love Vodacom to please arrange an appointment with my mother and brother (whom is also a Vodacom user) to do a proper signal test at her address.