Pensioner in Debt after Canceling

More then 20 years my mother was loyal customer to Vodacom, after she turn 65 and tried to minimize her contracts, she spoke to various person to CANCELLED her contract, but they just re sending her new contracts, after a few years she had more then 10 numbers on her name, halve off them not even working, her name and surname changes with every contract, but unfortunately her ID stays the same.

She is is debt now for more then R19000, she was never contacted after she cancelled her last number, We have the names of the persons that she told she is not interested in another contract, because like i also said before, she went on pension.

She had two laptops, but never got cancelled after two years,she gave in her faulty cellphone, never received it back also still under guarantee, they phone her to simswop for data and various airtime, for numbers that she did not even have on her name,

I will appreciated if somebody can come back to me regarding this, because this is becoming a problem in my mother future plans.