Remove agent not working

Hello,

I try with this script to remove the agent from a former client:

try
{
    $result = Get-WmiObject win32_product -filter "Name LIKE 'Pulseway'" | Select-Object IdentifyingNumber;
    [string]$a = $result.identifyingNumber;
    msiexec.exe /X $a /qn
    Remove-Item -Path "HKLM:\SOFTWARE\MMSOFT Design" -Recurse
    if (Test-Path -Path "C:\Program Files\Pulseway") {
      remove-item -path "C:\Program Files\Pulseway" -Force -Recurse -ErrorAction SilentlyContinue
    }
	Write-Host "$a Uninstallation completed successfully"
}
catch
{
	Write-Host "Uninstallation failed"
	Break
}

But it is still installed. So what can I to totally remove it?

{12CF5BF5-CA28-4904-A981-B3615F660468} Uninstallation completed successfully
PS C:\WINDOWS\system32> Get-WmiObject win32_product -filter "Name LIKE 'Pulseway'"
    

IdentifyingNumber : {12CF5BF5-CA28-4904-A981-B3615F660468}
Name              : Pulseway
Vendor            : MMSOFT Design
Version           : 8.9.1                              
Caption           : Pulseway