The problem
Leads come in, then get lost along the way
Leads from ads, your page and LINE end up in different places. The sales team can't reply fast enough or follow up with everyone, and nobody can say how many of 100 leads became customers. Cost per lead keeps climbing while some of the leads you already paid for simply drift away.
Salespeople are hard to hire and slow to train, so every deal drifts back to the owner. A good sales system moves each lead forward step by step and brings in a person once the lead is ready.