Terrible service after burst geyser

On a Sunday my geyser burst. Next day I had it checked. It turned out the geyser had holes in the inners because of rust. The Ariston geyser was only 2 years old. I went to the shop where I bought it. They reported the claim to Ariston and told me the geyser would be replaced on Tuesday or Wednesday morning. Tuesday afternoon I hadnt heard so I phoned them. They told me they have a 24hour turnaround time for claims, so somebody would be there Wednesday morning before 10 am to install a new geyser. Wednesday morning at 10.15 am I get a phone call from Ariston: "we don't have a plumber in your area, so we can only get you one next week"!!! I was not impressed. I asked them if I could get a local plumber to install, but they would only allow that if I paid for the installation myself! So they don't have good coverage and they make it my problem! I asked to speak with a supervisor. My call put through but then dropped (which happened to a lot of calls). Phoned again, had to explain the story to another agent. She would send an email to her supervisor. Never got any call from a supervisor. Next day I phoned them again as the plumber they assigned to my case could only come next week. Was getting desperate now as I really wanted hot water. Told them I will pay for the installation for now and then fight with them over the fee later. They would not give me a geyser unless I agreed not to claim for the installation fee. I phoned back that I reluctantly had to agree to that. They told me they could only arrange it next day. So finally on Friday , after I had agreed in writing not to claim for the installation fee, I fetched a new geyser myself from the shop and returned the old one.