There may not be guarantees in life, but there are at SoftAdvice:

• Direct access to support representatives via a direct service number.
• Extended office hours in the week prior to the VAT period with direct
  access to 3 rd line support staff.
• Lightning fast response, ditto solution. Urgent matters addressed in maximum
  4h.
• 15 (!!) percent discount on the hourly rate for intervention on location.
• Absolute priority at all levels.
• Access to the customer portal where you download manuals,
  follow up support requests online and track projects.
• Your company will be back on track in no time, the delay is by definition
  negligible.
• Fixed annual rate for support by mail screen capture or phone.
• Fair-use conditions.
• No invoicing per intervention but an all-in formula.
• Pro-active remote control and 1 x annual update of your software included.