(Adds plans by Telefonica to appeal)
MADRID Feb 10 Spain's leading telecoms operator Telefonica was fined 500,000 euros on Monday for what the regulator classed as two "very serious" breaches of competition rules in its home market.
A spokeswoman for the operator said the company planned to appeal both rulings.
Telefonica failed to make a timely notification to the competition authority, the CNMC, of the prices and conditions of new Internet and television packages, as it is required to as a dominant market operator.
In a statement, the CNMC said the rules were necessary to allow it to ensure a level playing field for other operators.
The operator denied this and said it always communicates all of its products to the regulator in a timely manner.
Telefonica was also found to have blocked access to 11 premium text message numbers being run by another company, also denied by the operator.
Telefonica is facing growing competition in its home market as cash-strapped Spaniards shop around for cheaper internet and phone offers. (Reporting by Sarah Morris and Robert Hetz; Editing by Paul Day, Fiona Ortiz and David Evans)