Bad service on faulty new laptop.

Bought a very expensive laptop in February. Started giving issues in October so registered for support. Promised in 3 to 5 working days, took longer. Technician could not repair, promised follow-up; was called and promised a collection on a particular date - email confirmation followed. No collection going on for 10 days now. Have sent emails (that have been read), no reply. Been onto website twice, got apology on chat and further promises, but still ignored. Costing me a lot because I now cannot work from home and have to travel over 100 km every working day at own cost to stay on line. Worst is that promises not kept, email ignored. Warranty clearly still valid, service still eligible, but the service stinks.