Faulty Ecu charged for repair and not repaired.

I took my Ecu in for testing. They gave me a report of multiple faults. They quoted me a major price (I am a pensioner) - over 6k to repair. I paid 50% deposit. 5 days later they phoned me and told me the Ecu was repaired. I went to fetch it and asked for a report after fixing - should be tested and a report issued. They told me it's fixed and there's no report. The technician repairing my car fitted the Ecu and it did not work. He did a diagnostics and found the Ecu had the same faults that it had before repairing. I suspect that the repair technicians are not properly trained to repair ECU's. I am really disappointed that a company like Ecu Express can do such bad work. This is a very bad reflection on the company and it damages the reputability of the said company. I am returning the Ecu and want an immediate repair and a report after the repair. I am not waiting 7 days as they advertise. Very unhappy pensioner.