were underselling
Past progressive conjugation of undersell. There are other translations for this conjugation.

undersell

I didn't think it was possible they were underselling you, but... they were.
No pensé que fuera posible que te estuvieran subestimando, pero... lo hacían.
I didn't think it was possible they were underselling you, but they were.
No pensé que fuera posible que te estuvieran subestimando, pero así fue.
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