Cape Town Refrigeration - horrible service with no guarantee

Be very carefull in dealing with this company - they charged me almost R4000 to regas my fridge and fix noisy fan. Fridge was working for 1 week, then stopped cooling again - i contacted them numerous times to come fix under their promised 'guaranteed workmanship' but they get extremely rude, with no intention to fix their work. Upon opening up the back cover, we determined that a lot of black goo was stuck to the pipes, the pencil dryer was NOT replaced (even after them showing me the 'old' one after the job), and no valve was installed on the piping through which the 're-gas' could possible be done? They also refuse to give me an invoice, after promising on the day that they would send to me that evening.