A visible number and what it hides
Dota is unusual in showing the rating itself rather than a badge. That makes an order easy to define and to verify, since the delivery is a number on a profile that either moved or did not. It is why orders in Dota 2 MMR boosting are quoted between two figures instead of between two tiers.
What the number hides is the pool it comes from. Role queue splits core and support ratings, and behaviour score decides the quality of teammates you are matched with regardless of either. A climb that ignores those two lands you at a higher number in the same kind of game, which is where a Dota 2 coaching session earns its price.
If the account itself carries the problem, Dota 2 accounts listings state behaviour standing as well as rating. The escrow behind every route is described in the Eloboost24 buying guide.
If you would rather play every game yourself, Dota 2 Fast Games books a verified player per match who joins your party in the position you name, and the MMR you gain is from your own account.