(b) To the extent practicable ,the bank will (but shall not be obliged to) give reasonable written notice to the customer (normally not less than seven (7) days in advance )by any means prescribed in Clause 14.4(Notice) of part specifying the relevant effective date. Notwithstanding the foregoing, in the event of any exceptional circumstances the Bank may in its discretion close, suspend, transfer or freeze any account and /or Service of the customer and /or regard any mandate it holds as being suspended without giving prior notice to the customer and also not withstanding that any relevant Account is in credit ,including the following :