Our company works with budgets that start with 50,000 rubles and we always sign a contract. We are aware of the urgency of the work for you, but at the same time we provide professional services and thus require compliance with contractual terms.
From our experience:
If we are buying backlinks or publish paid articles, it is imperative to sustain the frequency of both. If a client breaches the agreement and is late on his payments (consequently, previously bought backlinks get frozen and the links from articles decrease in frequency) how can we effectively promote their website?