Insuring a car in Spain, is not such a user-friendly process as it is in the UK, where you can get an online quote in minutes from any number of companies.
For example, in Spain, though you may be able to spread your payments in three amounts over the first three months, or by two six monthly payments, companies do not offer monthly direct debits for example. Though fully comprehensive and 3rd party fire and theft are offered as standard options, no claims bonuses are less favourable and generally offered as smaller percentages.
You might be surprised how many companies do not even send out yearly policy statements and renewals if the policy automatically renews with them. Cancelling a policy, often entails notifying a company 3 months before the expiry date and stories are legion of an insurance company being notified but still processing the policy.
If you do not speak fluent Spanish, you are strongly advised to find a broker who does speak your native tongue, or to use an intermediary who can act and negotiate on your behalf. This can be especially useful in the event of a claim which can also be a tortuous process.