Derbyshire trading standards are warning about a rogue company selling a blocking system for unwanted phone calls.
Officers at county council said that a sales company has been contacting residents in Derbyshire, offering them the system to prevent unwanted sales calls from the UK and overseas for a fee.
A trading standards spokesman said: “As money is involved the company are trying to obtain the resident’s bank details. Our advice to consumers is not to agree to any such service from anyone cold calling via the telephone and not to give their bank details to anyone, other than a trusted source. Sales calls can be blocked for free by registering with the Telephone Preference Service at www.tpsonline.org.uk or 0845 070 0707.”