Poor service by Samsung Constantia

I gave go-ahead for Samsung to reload by laptop and replace the battery on 13th February. I was told that the work would take max of 5 working days. Last week I followed up on the progress and was told they only received the parts on Monday and that a technician is working on it. Again on Monday I followed up and was told it was ready for collection, I went to collect was told it's not ready, wasting time and petrol to drive out there for nothing. It's now the end of week 3 and still no response from Samsung! I've always been a huge fan of the product, but the after sales care is horrible! If you takes 3 weeks to replace a battery and reload software I don't have much hope that any serious issues could be fixed by this centre.