Philips cordless vacuum cleaners - poor support!₩

Purchased a cordless vacuum cleaner 3 years ago for +/-R10 000. After 2 years the battery cut out at only 50% usage. Now it only holds the charge for 4 minutes. I have tried to buy a new battery but Philips tell me I have an old model (3 years old) so they don't sell replacement batteries. I must now go buy a new vacuum cleaner for another R10k! Poor support and poor service@ Hopefully Dyson support there product better than Philips!