Unfair to pensioner.

My mother, VL Adolph purchased a router and contract at Vodacom Mall@Carnival on 01/12/2022. The number of the contract is ***. It has only been 6 days since the purchase and she has decided that she does not need the device or the contract. She went to the store and they told her she cancel the contract even though the device hasn't been opened and the cooling off period has not expired. I called the store and spoke to the manager Neal Lensly who refuses to cancel the contract and accept return of the device. My mother is a pensioner and can ill afford the cost of the contract. Vodacom, please assist with cancelling the contract and purchase. As mentioned she is a pensioner and cannot afford. Even if this is Vodacom policy, surely and exception can be made for a pensioner?