Can I get a refund if I select a wrong recharge plan.

No, recharge of the wrong plan is not eligible for refunds.Recharge offers & plans uploaded on Truecaller Pay are provided directly by the service providers.

For example, all Vodafone prepaid mobile plans on Truecaller Pay are provided by Vodafone itself.
The service providers/operators reserve the full right to change the plans at any time. Request you to contact your operator for more help on this matter.