Pai International Electronics — Product damaged

We have purchased many products from pai electronics vijawada. We have purchased sofa cum bed in January, after the first installation, we couldn't use the bed, as it is not coming outside properly, we called pai, they installed again, still bed not coming freely, again called pai, fitter came and again adjusted it. But it was not coming freely we have called many times, in April fitter again visited and said it was broken don't sit on it, you may fall, we were shocked, they blamed us for the damage and said that u sat on it so it had broken . We bought it for sitting only, how come it will be broken by sitting, anyhow we asked them to uninstall it and to repair it as soon as possible so that we can use the product, stll no response from them, very irresponsible, we spent our money and welcomed new problems from pai electronics, totally unfare