Walmart complaint: Customer Service

I hired a handyman service through walmart.com. It was advertised on their site and promised a professional, vetted handyman experienced in my need, mounting a television, would be sent. I have been a loyal Wal-Mart customer for over 3 decades and trusted that if they offered a service on their website, that it would be trustworthy. The handyman mounted my television into drywall, not one single stud. Needless to say, it was a disaster waiting to happen. My television fell off the wall onto my entertainment center, breaking them both. The Happiness guarantee from Handy is ridiculous, but it wouldnt matter had they sent me a proffessional as I paid for and as they promised. My television cost me $742.00 and I bought it from Wal-Mart only five months ago. My entertainment center cost me $547.00 and I purchased it under a year ago. Both items were in perfect condition prior to the handyman and his negligence. The Handy guarantee refuses to pay the sales tax associated with reimbursing the items their handyman damaged. Luckily my dog or I were not in the area when the tv fell or this incident could have been much worse. I do not know how to mount a television and cannot do it on my own, but even I know that you need to find the studs in the wall to mount it properly. The fact that I hired this service and was guaranteed a professional and instead got an amateur who ruined my wall, tv and entertainment center, it is unacceptable to me to not be fully reimbursed for my damaged items. This was gross negligence sending a handyman who would mount a 65 television into hollow drywall, not the studs in the wall.