EUROPCAR Blamed for damage I'm not responsible for! I want my deposit! Still no communication from them!

Booked a car with Europcar OR Tambo over 20 days passed wit no invoice or deposit returned. called the branch and accounts only to be met with bad attitude and over 6 transfers from one unit to the next. finally someone finally gave me a response when i refused to be transferred for the 7th time. Apparently an email was sent to me reporting that i damaged the fuel line of the vehicle. Not true no communication was ever made to me and the lady who responded to my call took my email to send me invoice did not bother to do so. I did my research and from what i can find out a fuel line damage is something that happens over time and not TWO days!!! this sounds extremely suspicious to me, I'm not responsible to pay for a damage that was supposed to be monitored by the company!!! I want my deposit back!