[Resolved]  HSBC — Overcharging and overbilling

I have a HSBC masterdard for over 7 years with an excellent rating never having delayed/ skipped paying in time. Recently posted a check 4 days in advance only to discover in next bill an atrocious 50% late and finance charges, and no amount of convincing the customerservice agents was useful and am now complaining to the bank ombudsman for grievance redressal. Never go for HSBC credit card- my sincere advise.