It is never advisable to deal with cold callers or telesales enquiries, and you should always avoid doing doorstep business. Only deal with installers that offer you a written quotation without obligation.
Examples of bad practices associated with cold-calling and door-step selling include pressure selling, waiving your rights to a cooling off period, unclear contracts, over-priced security systems and unduly raising the fear of crime. Never sign up to long term monitoring contracts that require payment up front. Turn away any company that tries to scare you into purchasing an alarm with stories of burglaries in your area. If you feel a company has tried ‘hard sell’ tactics, you should consider contacting your local police or Trading Standards office