They do not honour their warranty

I've purchased a Red Rhino 750w water pump from the Strubensvalley branch in October last year. It was for an emergency water back up system so it didn't have to run as frequently as it should.

During July this year, the pump started tripping my 5KVA inverter. I removed the pump from my system and took it through to the Northriding store as it was closer to home. The returns department booked the pump in and sent it through to the supplier (KLB Engineering). The pump was returned a week later with a report stating there was nothing wrong with it. I disputed this but, being unsuccessful in this, accepted the pump and reconnected it to my system.

On the 11th of September the pump malfunctioned again. This time it switched on and refused to switch itself off. I had to cut power to it. Before switching it off, I noticed the fault light illuminated on the controller. After disconnecting it (2nd time incurring a cost from my plumber) I noticed the water that came out of the pump was a dark brown, showing the internals of the pump were either corroded or was leaking oil. I took the pump back to the Northriding store. The returns department (Beauty) understood my frustration and stated on the return slip that I'd like a refund as this was the 2nd time I had to bring the pump back and incurred almost half the price of the pump in plumbers fees. The supplier called me on Thursday (14th September) to ask what was wrong with the pump. I explained the issue to her. The next week Thursday (21st September) I received notification that my pump was ready for collection and the suppliers report said there was no fault on the pump. I called the store asking how that could be as the desired outcome was to be a refund due to the repetition of the issue with the pump and it was impossible for the report to show no fault. Beauty then advised I should call the supplier. I explained that I didn't purchase the pump from the supplier. I purchased it from Builders. I went through to the Northriding store and Beauty referred me to Khotso (her manager). He could not resolve my issue so referred me to Keith (branch manager). He showed no sympathy towards the situation and totally lacked any competence. I tried simplifying the issue in my explanation but he just wasn't understanding. How is someone like that trusted to manage a branch? Khotso then proceeded to email the supplier as I refused to accept the pump and incur further costs to reinstall and then remove to bring back to the store as the issue with the pump definitely still exists.

I await a favourable response.