Faulty geyser with 5 year warranty

We had a geyser replaced in 2023 with an Ariston axis that has a 5 year warranty The geyser had been leaking for months in 2026 our water bill was ******ionately high every month, then it started leaking from the overflow, that's only when we realized that there was a problem with the geyser We had someone come out and check and replace but now that it is fixed Ariston Thermo south africa will jot give us our money back because we had an experienced person take it out, what were we supposed to do? Leave it in have no water till Ariston decides to come out and check, have no water for weeks? With kids and elderly? They refuse to refund us