KIA Motors review: the quality tyre

On 2017 I bought a KIA Carnival which is new car not secondhand car fitted with NIXEN N Priz RH7 tires. In Feb 2019 (millage 34, 512km) my original car Tyre was swollen. I made a report to KIA Plentong, but did not get any responses.

On June 3, 2019 when I returned hometown, one side of my back tyre swelled, I had to change the tyre in Kuala Kangsar. On June 8, 2019 I went to Terengganu Dungun, another side of back tyre swell, I had to change (millage 40000km). I would like to complaint where the quality of KIA is. I also took the K5 package.
I use the KIA car from NAZA RIA (11 years) to KIA Carnival. I believe in the quality of KIA.
But today I feel so disappointed with the quality given by KIA.

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