"Ofcom has opened this investigation following a significant increase in the number of Tesco Telecoms’ orders cancelled using the ‘Cancel Other’ process. ‘Cancel Other’ is the industry term for a process whereby (during the 10 working day transfer period) the losing provider is able to cancel an order to switch a consumer to another provider. The use of ‘Cancel Other’ is only permitted in certain circumstances, including where an allegation of mis-selling has been made by the consumer or where the gaining provider fails to cancel a transfer upon the consumer’s request.

Ofcom has also received complaints from consumers who allege they were mis-sold Tesco Telecoms’ fixed-line telephone service. Complainants also allege that Tesco Telecoms failed to cancel orders on request and/or that consumers were forced to contact their existing supplier to prevent the transfer of service to Tesco Telecoms. "

http://www.ofcom.org.uk/bulletins/comp_bull_index/comp_bull_ocases/open_all/cw_957/