Bad and worst service ever

I bought a CAT cordless drill in February and know it is faulty. I took it back to builders warehouse george. Unfortunately I forgot the invoice in Struisbaai. They did not want to help me without invoice . So I supp**** them with the date of purchase and builders card and asked them tho reprint the invoice. They said they would not be able to help because the system only keeps the last 3 months information. They would not be able to print a February invoice. I had to drive 320km back to Struisbaai for the invoice I lodge a complaint on Instagram and builders head office contact me make al sorts of promises. I send the copy of the invoice to head office and nothing happened. I drove back to 320km to George from Struisbaai to hand in the drill at builders. This was about two weeks ago. I handed it in and they made a copy of the invoice and then they said the invoice was to faded. They will do a reprint from the system. I said you told me you couldn't find the invoice on the system previously but you can now. What about the 3 months. They **** to me about this. Yesterday Builders warehouse george phoned me and said they are still waiting for me to supp**** the invoice .I told them that they do have a copy of the invoice and that said they will reprint it. She said she will get back to me because the supplier wants the invoice. On the day I handed it in they said CAT will assist the drill to see if it was abused and then they will decide if they will repair or replace. This is also unacceptable. It is still under warranty . Builders said one year warranty but according to the CAT rep it must be 3 year