Replacement modems Out of Stock

On the 15/01,i reported that my modem was not working.I was then advised that the unit will be replaced.I escalated the billing part of the query to the billing department indicating that how can Mweb charge me the full instalement when they dont have stock of modems.I have not used the service from Mweb since 15/01 yet my bank account was debitted for the full instalement due.I called Mweb this morning stating that i was a new client and i asked if i signed up immediately,do they have stocks of modems and i was advised yes.So,does Mweb issue new clients devices but ignore their existing clients.I was told that sales was seperate to technical support.Mweb cant tell me when they will have stock of the replacement modems and continue to string me along and charge me in full.If there is a supply issue from the supplier,pls tell me whats happening otherwise cancel my contract and i will move to Telkom with immediate affect.