V-model doesn't update in select

[caglar-kaya]

<div class="col-md-4" v-if="!sales.parent_selected">
        <div class="form-group">
            <label class="control-label">{{ $t('sales.invoice_freq') }}</label>
            <v-select :options="freqs" v-model="sales.invoice_freq_selected"></v-select>
            <label class="control-label">{{ sales.invoice_freq_selected }}</label>
        </div>
</div>

    sales(state, sales) {

        // Set sales
        state.sales = sales;

        // Parent Sales v-select
        state.sales.parent_selected = (sales.parent) ? { value: sales.parent.id, label: sales.parent.contract_nr + ' - ' + sales.parent.name } : null;

        // Set v-select fields (value/label)
        state.sales.invoice_freq_selected = state.freqs.find(i => i.value === state.sales.invoice_freq)
        state.sales.invoice_scenario_selected = state.invoice_scenarios.find(i => i.value === state.sales.invoice_scenario)
    },

[caglar-kaya]

After changing selection bottom label doesn't update. How can I fix it?