State Bank Of India [SBI] — Online payment and Net banking

Address: 517214

SBI closing the online banking login sessions abruptly. SBI online payment system (Ex: IIT JEE Advanced Payment) forcing candidates to other payment methods other than net banking to generate revenue in the name of bank charges. 5 times my payment method stopped showing technical reason.
When I login to online banking, session will close automatically and it will repeat continuously (3-4 times). From one week I'm trying to add third party A/C no to my account, I can't able to add it. Becoz Can't able receive verification code to my phone or through ATM showing technical problem and forcing customers to go to crowded bank branch nearest and wasting time and energy of customers. I'm facing worst experiences with SBI online services.