Poor service and lack of accountability

We are a long term client of delonghi with 3 coffee machines in operation during our time at our guest lodge and in our private house. We needed a repair of one of the machines and contacted delonghi in Johannesburg/south africa which referred us to the service partner Lowveld Service in Nelspruit. We reveiced a quote of R2,500.00 for the repair from the Nelspruit service centre and paid in full. On visiting the service centre the machine showed the same fault and needed to be sent to Delonghi in Johannesburg. We swiftly received an additional quote of R1,700.00 for the repair. The total of R4,200.00 is roughly 50% of a new machine which we would have never agreed to. Neither one of the service stations wants to take any responsibility.