Faulty Tesco replacement LED bulbs

In Oct 2019 I decided it was time to upgrade my domestic 230V AC tungsten bulbs to more energy efficient LED bulbs.
When I visited my local Tesco, I bought five LED bulbs. I made sure two of them were 'dimmable' since I have a pair of lamps plus a dimmer switch in my lounge.
The packaging stated a life expectancy of 15 years.

When I got home and tried them, I found the dimmer switch made a loud 50Hz buzzing noise that was totally unacceptable.
I reverted back to tungsten bulbs and fitted the two LED bulbs in my kitchen instead (no dimmer).
They seemed to work ok for a while.

However, more recently, after they have been on for several minutes and the base becomes hot, they begin to flicker, apparently at random.
This can be very annoying.

I tried to find an email address for Tesco Customer Services to complain but found nothing.

It may be 2 years since I bought the bulbs, but I don't see why I should put up with something that doesn't work properly.
What should I do?



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