They have produced plenty of foliage, but no sign of stem, bud or flower.
Crocuses are great bulbs to use for adding a splash of colour to the garden in winter and spring.
Therefore, check which type you have as they may flower later in the season. If you were advised to plant in October I suspect that your bulbs are the spring flowering type, as this is too late to plant for flowers in November. If you don't get any flowers in spring, you may have planted the bulbs a little deep. As a general rule bulbs should be planted in a hole that is 2.5 times deeper than the bulb is wide. Therefore crocus should be about 8cm deep.