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もらわねば

if ... don't get someone to do something

→ 貰う
もらわ receive, get + ねば necessitative (must)
auxiliary · necessitative Rare #41,482
if ... don't get someone to do something A formal or literary form, typically used in ～てもらわねばならない, meaning “must have someone do ...” or “must get someone to ...”.
JA: 彼に手伝ってもらわねばならない。
EN: I must get him to help me.
Conjugation of 貰う
Necessitative
もらわねば

やはりあの人に来てもらわねば。

After all, we'll have to get that person to come.

— 崖の上のポニョ (2008)

あなたはすぐ医者に診てもらわねばならない。

You need to see a doctor right away.

君に行ってもらわねば承知しない。

You must go, or I won’t accept it.