Cancellation of Vodacom contract

I have two cellphone contracts with Vodacom, one of which was exclusively used by my late husband who passed in September this year. As I don't need two contracts and the cellphone he has was almost 3 years old. Upon trying to cancel the contract that only ends in 2027, I was sent an offer to pay over R3000 that included the device and the balance of the contract. I tried to explain that I no longer needed two contracts and showed them my husband's death certificate. This was all to no avail and the cellphone is now switched off and lying in a drawer. I can't sell it as the contract is still valid until 2027! I have been a Vodacom customer for approximately 25 years, I am now a widow and Vodacom do no care. In fact, my monthly invoice has increased since September 2025 so how does that happen? Anyone?