Concrete Technology

One of 2 concrete slab poured by Mr. [redacted] company is disintegrating, in less than 2 years.After pouring concrete for our new home, in 2013, we asked Mr. [redacted] to pour 2 additional small slabs, with certain specs (4500 psi, etc.)He was paid $ 500. One of those slabs is disintegrating, even though no vehicles except our own have driven over the slab. The slabs were roped off by his men to allow adequate curing time and no vehicles drove over either slab, as he requested.I left Mr. [redacted] several voice mails over the last several months, with no response. I was able to catch him on his phone and spoke to him personally on 7/17 and 8/14, He said that he would call and stop by and check the work. He has not done that.As he does not seem very interested in resolving our issue, we would like the slab replaced or be refunded half of the money, so we can get someone else to pour a new slab./////Desired SettlementReplacement of the slab or a refund for half of the money, so we can get someone to pour a new slab./////