Disgusting service or lack of service from RCS

I used the RCS site to make my monthly account payment on the 19th of April. The amount still does not reflect in my account. In spite of asking for an explanation as to where this money has gone TWICE and sending my bank statement nobody from RCS has bothered to contact me. When I phoned the call centre I was told to find out from my bank which account this money went into NO!!! I am the customer and I paid the money using the RCS site. The onus on me is only to provide my bank statement as proof that the amount was paid. Disgusting service or rather lack of service.