Cooper tyres useless

I baught 4 new cooper discoverer AT 3 tyres and the sidewals of all 4 cracked within 20 000 km or less and one was so bad that i had to replace it, it has been about 10 months now and i can still not get any feedback or anything for it to be replaced i am very dissapointed in these tyres and wont recomend it to anybody as it is a very poor tyre and has no customer service the spite of its gantee

Verry dissapointed customer