Quality not to be experienced

I purchased a new tablet online from hifi corporation 24 September 2017, received delivery 26 September 2017. Was busy setting it up only to find that the screen was coming away from the housing, went through to HiFi corporation had it swapped out 01 October 2017 busy setting it up this evening 03 October 2017 only to find out that the screen is not responding as it should. The problem is that the guy at customer service at hifi corporation is arrogant and the second point is that I can't be going to and fro. Sansui doesn't have any contact information for customer service. Totally disappointed.